Mercurial > hg > nginx-site
annotate xml/en/docs/freebsd_tuning.xml @ 567:7ff0dd5fe6f0
Updated with Netcraft July 2012 Web Server Survey stats.
author | Ruslan Ermilov <ru@nginx.com> |
---|---|
date | Tue, 03 Jul 2012 13:25:07 +0000 |
parents | 4c6d2c614d2c |
children | be54c443235a |
rev | line source |
---|---|
50 | 1 <!DOCTYPE article SYSTEM "../../../dtd/article.dtd"> |
0
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
2 |
123
7db449e89e92
Unified the use of the "name" attribute instead of "title".
Ruslan Ermilov <ru@nginx.com>
parents:
121
diff
changeset
|
3 <article name="Tuning FreeBSD for the highload" |
0
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
4 link="/en/docs/tuning_freebsd.html" |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
5 lang="en"> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
6 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
7 |
121
49443032011c
Unified <section> syntax for "article" and "module" documents.
Ruslan Ermilov <ru@nginx.com>
parents:
50
diff
changeset
|
8 <section name="Syncache and syncookies"> |
0
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
9 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
10 <para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
11 We look at how various kernel settings affect ability of the kernel |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
12 to process requests. Let’s start with TCP/IP connection establishment. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
13 </para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
14 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
15 <para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
16 [ syncache, syncookies ] |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
17 </para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
18 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
19 </section> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
20 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
21 |
121
49443032011c
Unified <section> syntax for "article" and "module" documents.
Ruslan Ermilov <ru@nginx.com>
parents:
50
diff
changeset
|
22 <section id="listen_queues" |
49443032011c
Unified <section> syntax for "article" and "module" documents.
Ruslan Ermilov <ru@nginx.com>
parents:
50
diff
changeset
|
23 name="Listen queues"> |
0
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
24 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
25 <para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
26 After the connection has been established it is placed in the listen queue |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
27 of the listen socket. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
28 To see the current listen queues state, you may run the command |
148
682163f2b298
Unified article/path and module/pathname into a single "path".
Ruslan Ermilov <ru@nginx.com>
parents:
123
diff
changeset
|
29 “<command>netstat -Lan</command>”: |
0
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
30 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
31 <programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
32 Current listen queue sizes (qlen/incqlen/maxqlen) |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
33 Proto Listen Local Address |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
34 tcp4 <b>10</b>/0/128 *.80 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
35 tcp4 0/0/128 *.22 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
36 </programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
37 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
38 This is a normal case: the listen queue of the port *:80 contains |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
39 just 10 unaccepted connections. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
40 If the web server is not able to handle the load, you may see |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
41 something like this: |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
42 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
43 <programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
44 Current listen queue sizes (qlen/incqlen/maxqlen) |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
45 Proto Listen Local Address |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
46 tcp4 <b>192/</b>0/<b>128</b> *.80 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
47 tcp4 0/0/128 *.22 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
48 </programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
49 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
50 Here are 192 unaccepted connections and most likely new coming connections |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
51 are discarding. Although the limit is 128 connections, FreeBSD allows |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
52 to receive 1.5 times connections than the limit before it starts to discard |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
53 the new connections. You may increase the limit using |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
54 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
55 <programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
56 sysctl kern.ipc.somaxconn=4096 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
57 </programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
58 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
59 However, note that the queue is only a damper to quench bursts. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
60 If it is always overflowed, this means that you need to improve the web server, |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
61 but not to continue to increase the limit. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
62 You may also change the listen queue maximum size in nginx configuration: |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
63 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
64 <programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
65 listen 80 backlog=1024; |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
66 </programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
67 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
68 However, you may not set it more than the current |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
69 <path>kern.ipc.somaxconn</path> value. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
70 By default nginx uses the maximum value of FreeBSD kernel. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
71 </para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
72 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
73 <para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
74 <programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
75 </programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
76 </para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
77 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
78 <para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
79 <programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
80 </programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
81 </para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
82 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
83 </section> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
84 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
85 |
121
49443032011c
Unified <section> syntax for "article" and "module" documents.
Ruslan Ermilov <ru@nginx.com>
parents:
50
diff
changeset
|
86 <section id="sockets_and_files" |
49443032011c
Unified <section> syntax for "article" and "module" documents.
Ruslan Ermilov <ru@nginx.com>
parents:
50
diff
changeset
|
87 name="Sockets and files"> |
0
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
88 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
89 <para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
90 [ sockets, files ] |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
91 </para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
92 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
93 </section> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
94 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
95 |
121
49443032011c
Unified <section> syntax for "article" and "module" documents.
Ruslan Ermilov <ru@nginx.com>
parents:
50
diff
changeset
|
96 <section id="socket_buffers" |
49443032011c
Unified <section> syntax for "article" and "module" documents.
Ruslan Ermilov <ru@nginx.com>
parents:
50
diff
changeset
|
97 name="Socket buffers"> |
0
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
98 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
99 <para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
100 When a client sends a data, the data first is received by the kernel |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
101 which places the data in the socket receiving buffer. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
102 Then an application such as the web server |
271 | 103 may call <c-func>recv</c-func> or <c-func>read</c-func> system calls |
0
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
104 to get the data from the buffer. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
105 When the application wants to send a data, it calls |
271 | 106 <c-func>send</c-func> or <c-func>write</c-func> |
0
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
107 system calls to place the data in the socket sending buffer. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
108 Then the kernel manages to send the data from the buffer to the client. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
109 In modern FreeBSD versions the default sizes of the socket receiving |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
110 and sending buffers are respectively 64K and 32K. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
111 You may change them on the fly using the sysctls |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
112 <path>net.inet.tcp.recvspace</path> and |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
113 <path>net.inet.tcp.sendspace</path>. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
114 Of course the bigger buffer sizes may increase throughput, |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
115 because connections may use bigger TCP sliding windows sizes. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
116 And on the Internet you may see recomendations to increase |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
117 the buffer sizes to one or even several megabytes. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
118 However, such large buffer sizes are suitable for local networks |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
119 or for networks under your control. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
120 Since on the Internet a slow modem client may ask a large file |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
121 and then it will download the file during several minutes if not hours. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
122 All this time the megabyte buffer will be bound to the slow client, |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
123 although we may devote just several kilobytes to it. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
124 </para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
125 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
126 <para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
127 There is one more advantage of the large sending buffers for |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
128 the web servers such as Apache which use the blocking I/O system calls. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
129 The server may place a whole large response in the sending buffer, then may |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
130 close the connection, and let the kernel to send the response to a slow client, |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
131 while the server is ready to serve other requests. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
132 You should decide what is it better to bind to a client in your case: |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
133 a tens megabytes Apache/mod_perl process |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
134 or the hundreds kilbytes socket sending buffer. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
135 Note that nginx uses non-blocking I/O system calls |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
136 and devotes just tens kilobytes to connections, |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
137 therefore it does not require the large buffer sizes. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
138 </para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
139 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
140 <para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
141 [ dynamic buffers ] |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
142 </para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
143 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
144 </section> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
145 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
146 |
121
49443032011c
Unified <section> syntax for "article" and "module" documents.
Ruslan Ermilov <ru@nginx.com>
parents:
50
diff
changeset
|
147 <section id="mbufs" |
49443032011c
Unified <section> syntax for "article" and "module" documents.
Ruslan Ermilov <ru@nginx.com>
parents:
50
diff
changeset
|
148 name="mbufs, mbuf clusters, etc."> |
0
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
149 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
150 <para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
151 Inside the kernel the buffers are stored in the form of chains of |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
152 memory chunks linked using the <i>mbuf</i> structures. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
153 The mbuf size is 256 bytes and it can be used to store a small amount |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
154 of data, for example, TCP/IP header. However, the mbufs point mostly |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
155 to other data stored in the <i>mbuf clusters</i> or <i>jumbo clusters</i>, |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
156 and in this kind they are used as the chain links only. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
157 The mbuf cluster size is 2K. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
158 The jumbo cluster size can be equal to a CPU page size (4K for i386 and amd64), |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
159 9K, or 16K. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
160 The 9K and 16K jumbo clusters are used mainly in local networks with Ethernet |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
161 frames larger than usual 1500 bytes, and they are beyond the scope of |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
162 this article. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
163 The page size jumbo clusters are usually used for sending only, |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
164 while the mbuf clusters are used for both sending and receiving. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
165 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
166 To see the current usage of the mbufs and clusters and their limits, |
148
682163f2b298
Unified article/path and module/pathname into a single "path".
Ruslan Ermilov <ru@nginx.com>
parents:
123
diff
changeset
|
167 you may run the command <nobr>“<command>netstat -m</command>”.</nobr> |
0
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
168 Here is a sample from FreeBSD 7.2/amd64 with the default settings: |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
169 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
170 <programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
171 1477/<b>3773/5250 mbufs</b> in use (current/cache/total) |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
172 771/2203/<b>2974/25600 mbuf clusters</b> in use (current/cache/total/max) |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
173 771/1969 mbuf+clusters out of packet secondary zone in use |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
174 (current/cache) |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
175 296/863/<b>1159/12800 4k (page size) jumbo clusters</b> in use |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
176 (current/cache/total/max) |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
177 0/0/0/6400 9k jumbo clusters in use (current/cache/total/max) |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
178 0/0/0/3200 16k jumbo clusters in use (current/cache/total/max) |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
179 3095K/8801K/11896K bytes allocated to network(current/cache/total) |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
180 0/0/0 requests for mbufs denied (mbufs/clusters/mbuf+clusters) |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
181 0/0/0 requests for jumbo clusters denied (4k/9k/16k) |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
182 0/0/0 sfbufs in use (current/peak/max) |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
183 0 requests for sfbufs denied |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
184 0 requests for sfbufs delayed |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
185 523590 requests for I/O initiated by sendfile |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
186 0 calls to protocol drain routines |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
187 </programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
188 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
189 There are 12800 page size jumbo clusters, |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
190 therefore they can store only 50M of data. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
191 If you set the <path>net.inet.tcp.sendspace</path> to 1M, |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
192 then merely 50 slow clients will take all jumbo clusters |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
193 requesting large files. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
194 </para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
195 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
196 <para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
197 You may increase the clusters limits on the fly using: |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
198 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
199 <programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
200 sysctl kern.ipc.nmbclusters=200000 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
201 sysctl kern.ipc.nmbjumbop=100000 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
202 </programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
203 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
204 The former command increases the mbuf clusters limit |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
205 and the latter increases page size jumbo clusters limit. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
206 Note that all allocated mbufs clusters will take about 440M physical memory: |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
207 (200000 × (2048 + 256)) because each mbuf cluster requires also the mbuf. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
208 All allocated page size jumbo clusters will take yet about 415M physical memory: |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
209 (100000 × (4096 + 256)). |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
210 And together they may take 845M. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
211 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
212 <note> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
213 The page size jumbo clusters have been introduced in FreeBSD 7.0. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
214 In earlier versions you should tune only 2K mbuf clusters. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
215 Prior to FreeBSD 6.2, the <path>kern.ipc.nmbclusters</path> value can be |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
216 set only on the boot time via loader tunnable. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
217 </note> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
218 </para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
219 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
220 <para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
221 On the amd64 architecture FreeBSD kernel can use for sockets buffers |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
222 almost all physical memory, |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
223 while on the i386 architecture no more than 2G memory can be used, |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
224 regardless of the available physical memory. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
225 We will discuss the i386 specific tunning later. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
226 </para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
227 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
228 <para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
229 There is way not to use the jumbo clusters while serving static files: |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
230 the <i>sendfile()</i> system call. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
231 The sendfile allows to send a file or its part to a socket directly |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
232 without reading the parts in an application buffer. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
233 It creates the mbufs chain where the mufs point to the file pages that are |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
234 already present in FreeBSD cache memory, and passes the chain to |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
235 the TCP/IP stack. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
236 Thus, sendfile decreases both CPU usage by omitting two memory copy operations, |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
237 and memory usage by using the cached file pages. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
238 </para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
239 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
240 <para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
241 And again, the amd64 sendfile implementation is the best: |
271 | 242 the zeros in the <nobr>“<literal>netstat -m</literal>”</nobr> output |
0
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
243 <programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
244 ... |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
245 <b>0/0/0</b> sfbufs in use (current/peak/max) |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
246 ... |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
247 </programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
248 mean that there is no <i>sfbufs</i> limit, |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
249 while on i386 architecture you should to tune them. |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
250 </para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
251 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
252 <!-- |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
253 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
254 <para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
255 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
256 <programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
257 vm.pmap.pg_ps_enabled=1 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
258 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
259 vm.kmem_size=3G |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
260 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
261 net.inet.tcp.tcbhashsize=32768 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
262 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
263 net.inet.tcp.hostcache.cachelimit=40960 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
264 net.inet.tcp.hostcache.hashsize=4096 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
265 net.inet.tcp.hostcache.bucketlimit=10 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
266 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
267 net.inet.tcp.syncache.hashsize=1024 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
268 net.inet.tcp.syncache.bucketlimit=100 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
269 </programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
270 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
271 <programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
272 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
273 net.inet.tcp.syncookies=0 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
274 net.inet.tcp.rfc1323=0 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
275 net.inet.tcp.sack.enable=1 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
276 net.inet.tcp.fast_finwait2_recycle=1 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
277 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
278 net.inet.tcp.rfc3390=0 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
279 net.inet.tcp.slowstart_flightsize=2 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
280 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
281 net.inet.tcp.recvspace=8192 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
282 net.inet.tcp.recvbuf_auto=0 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
283 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
284 net.inet.tcp.sendspace=16384 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
285 net.inet.tcp.sendbuf_auto=1 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
286 net.inet.tcp.sendbuf_inc=8192 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
287 net.inet.tcp.sendbuf_max=131072 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
288 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
289 # 797M |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
290 kern.ipc.nmbjumbop=192000 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
291 # 504M |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
292 kern.ipc.nmbclusters=229376 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
293 # 334M |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
294 kern.ipc.maxsockets=204800 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
295 # 8M |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
296 net.inet.tcp.maxtcptw=163840 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
297 # 24M |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
298 kern.maxfiles=204800 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
299 </programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
300 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
301 </para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
302 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
303 <para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
304 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
305 <programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
306 sysctl net.isr.direct=0 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
307 </programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
308 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
309 <programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
310 sysctl net.inet.ip.intr_queue_maxlen=2048 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
311 </programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
312 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
313 </para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
314 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
315 --> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
316 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
317 </section> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
318 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
319 |
121
49443032011c
Unified <section> syntax for "article" and "module" documents.
Ruslan Ermilov <ru@nginx.com>
parents:
50
diff
changeset
|
320 <section id="proxying" |
49443032011c
Unified <section> syntax for "article" and "module" documents.
Ruslan Ermilov <ru@nginx.com>
parents:
50
diff
changeset
|
321 name="Proxying"> |
0
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
322 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
323 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
324 <programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
325 net.inet.ip.portrange.randomized=0 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
326 net.inet.ip.portrange.first=1024 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
327 net.inet.ip.portrange.last=65535 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
328 </programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
329 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
330 </section> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
331 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
332 |
121
49443032011c
Unified <section> syntax for "article" and "module" documents.
Ruslan Ermilov <ru@nginx.com>
parents:
50
diff
changeset
|
333 <section id="finalizing_connection" |
49443032011c
Unified <section> syntax for "article" and "module" documents.
Ruslan Ermilov <ru@nginx.com>
parents:
50
diff
changeset
|
334 name="Finalizing connection"> |
0
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
335 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
336 <programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
337 net.inet.tcp.fast_finwait2_recycle=1 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
338 </programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
339 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
340 </section> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
341 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
342 |
121
49443032011c
Unified <section> syntax for "article" and "module" documents.
Ruslan Ermilov <ru@nginx.com>
parents:
50
diff
changeset
|
343 <section id="i386_specific_tuning" |
49443032011c
Unified <section> syntax for "article" and "module" documents.
Ruslan Ermilov <ru@nginx.com>
parents:
50
diff
changeset
|
344 name="i386 specific tuning"> |
0
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
345 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
346 <para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
347 [ KVA, KVM, nsfbufs ] |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
348 </para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
349 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
350 </section> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
351 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
352 |
121
49443032011c
Unified <section> syntax for "article" and "module" documents.
Ruslan Ermilov <ru@nginx.com>
parents:
50
diff
changeset
|
353 <section id="minor_optmizations" |
49443032011c
Unified <section> syntax for "article" and "module" documents.
Ruslan Ermilov <ru@nginx.com>
parents:
50
diff
changeset
|
354 name="Minor optimizations"> |
0
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
355 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
356 <para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
357 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
358 <programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
359 sysctl kern.random.sys.harvest.ethernet=0 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
360 </programlisting> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
361 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
362 </para> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
363 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
364 </section> |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
365 |
61e04fc01027
Initial import of the nginx.org website.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
366 </article> |