nginx-site: xml/en/docs/freebsd

annotate xml/en/docs/freebsd_tuning.xml @ 50:9d544687d02c

Fixed DOCTYPE declaration.

author	Ruslan Ermilov <ru@nginx.com>
date	Mon, 03 Oct 2011 10:47:56 +0000
parents	61e04fc01027
children	49443032011c

rev	line source
50 9d544687d02c Fixed DOCTYPE declaration. Ruslan Ermilov <ru@nginx.com> parents: 0 diff changeset	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
61e04fc01027 Initial import of the nginx.org website. Ruslan Ermilov <ru@nginx.com> parents: diff changeset	3 <article title="Tuning FreeBSD for the highload"
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
61e04fc01027 Initial import of the nginx.org website. Ruslan Ermilov <ru@nginx.com> parents: diff changeset	8 <section title="Syncache and syncookies">
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
61e04fc01027 Initial import of the nginx.org website. Ruslan Ermilov <ru@nginx.com> parents: diff changeset	22 <section name="listen_queues"
61e04fc01027 Initial import of the nginx.org website. Ruslan Ermilov <ru@nginx.com> parents: diff changeset	23 title="Listen queues">
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
61e04fc01027 Initial import of the nginx.org website. Ruslan Ermilov <ru@nginx.com> parents: diff changeset	29 <path>netstat -Lan</path>:
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
61e04fc01027 Initial import of the nginx.org website. Ruslan Ermilov <ru@nginx.com> parents: diff changeset	86 <section name="sockets_and_files"
61e04fc01027 Initial import of the nginx.org website. Ruslan Ermilov <ru@nginx.com> parents: diff changeset	87 title="Sockets and files">
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
61e04fc01027 Initial import of the nginx.org website. Ruslan Ermilov <ru@nginx.com> parents: diff changeset	96 <section name="socket_buffers"
61e04fc01027 Initial import of the nginx.org website. Ruslan Ermilov <ru@nginx.com> parents: diff changeset	97 title="Socket buffers">
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
61e04fc01027 Initial import of the nginx.org website. Ruslan Ermilov <ru@nginx.com> parents: diff changeset	103 may call <code>recv()</code> or <code>read()</code> system calls
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
61e04fc01027 Initial import of the nginx.org website. Ruslan Ermilov <ru@nginx.com> parents: diff changeset	106 <code>send()</code> or <code>write()</code>
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
61e04fc01027 Initial import of the nginx.org website. Ruslan Ermilov <ru@nginx.com> parents: diff changeset	147 <section name="mbufs"
61e04fc01027 Initial import of the nginx.org website. Ruslan Ermilov <ru@nginx.com> parents: diff changeset	148 title="mbufs, mbuf clusters, etc.">
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,
61e04fc01027 Initial import of the nginx.org website. Ruslan Ermilov <ru@nginx.com> parents: diff changeset	167 you may run the command <nobr><path>netstat -m</path>.</nobr>
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:
61e04fc01027 Initial import of the nginx.org website. Ruslan Ermilov <ru@nginx.com> parents: diff changeset	242 the zeros in the <nobr><path>netstat -m</path></nobr> output
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
61e04fc01027 Initial import of the nginx.org website. Ruslan Ermilov <ru@nginx.com> parents: diff changeset	320 <section name="proxying"
61e04fc01027 Initial import of the nginx.org website. Ruslan Ermilov <ru@nginx.com> parents: diff changeset	321 title="Proxying">
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
61e04fc01027 Initial import of the nginx.org website. Ruslan Ermilov <ru@nginx.com> parents: diff changeset	333 <section name="finalizing_connection"
61e04fc01027 Initial import of the nginx.org website. Ruslan Ermilov <ru@nginx.com> parents: diff changeset	334 title="Finalizing connection">
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
61e04fc01027 Initial import of the nginx.org website. Ruslan Ermilov <ru@nginx.com> parents: diff changeset	343 <section name="i386_specific_tuning"
61e04fc01027 Initial import of the nginx.org website. Ruslan Ermilov <ru@nginx.com> parents: diff changeset	344 title="i386 specific tuning">
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
61e04fc01027 Initial import of the nginx.org website. Ruslan Ermilov <ru@nginx.com> parents: diff changeset	353 <section name="minor_optmizations"
61e04fc01027 Initial import of the nginx.org website. Ruslan Ermilov <ru@nginx.com> parents: diff changeset	354 title="Minor optimizations">
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>

Mercurial > hg > nginx-site

annotate xml/en/docs/freebsd_tuning.xml @ 50:9d544687d02c