jim 98/05/29 08:33:20
Modified: htdocs/manual/misc perf-bsd44.html Log: Have people use sysctl to adjust somaxconn instead of the bogus and incorrect method we suggested before Revision Changes Path 1.12 +21 -5 apache-1.3/htdocs/manual/misc/perf-bsd44.html Index: perf-bsd44.html =================================================================== RCS file: /export/home/cvs/apache-1.3/htdocs/manual/misc/perf-bsd44.html,v retrieving revision 1.11 retrieving revision 1.12 diff -u -r1.11 -r1.12 --- perf-bsd44.html 1998/05/20 20:21:30 1.11 +++ perf-bsd44.html 1998/05/29 15:33:19 1.12 @@ -112,7 +112,6 @@ # Network options. NMBCLUSTERS defines the number of mbuf clusters and # defaults to 256. This machine is a server that handles lots of traffic, # so we crank that value. -options SOMAXCONN=256 # max pending connects options NMBCLUSTERS=4096 # mbuf clusters at 4096 # @@ -122,10 +121,6 @@ options OPEN_MAX=512 # maximum fds (breaks RPC svcs) </PRE> -SOMAXCONN is not derived from maxusers, so you'll always need to increase -that yourself. We used a value guaranteed to be larger than Apache's -default for the listen() of 128, currently. - <P> In many cases, NMBCLUSTERS must be set much larger than would appear @@ -160,6 +155,27 @@ files). If you've got a lot of other activity besides httpd on the same machine, you'll have to set NPROC higher still. In this example, the NPROC value derived from maxusers proved sufficient for our load. + +<P> + +To increase the size of the <CODE>listen()</CODE> queue, you need to +adjust the value of SOMAXCONN. SOMAXCONN is not derived from maxusers, +so you'll always need to increase that yourself. We use a value guaranteed +to be larger than Apache's default for the listen() of 128, currently. +The actual value for SOMAXCONN is set in <CODE>sys/socket.h</CODE>. +The best way to adjust this parameter is run-time, rather than changing +it in this header file and thus hardcoding a value in the kernel and +elsewhere. To do this, edit <CODE>/etc/rc.local</CODE> and add the +following line: +<PRE> + /usr/sbin/sysctl -w kern.somaxconn=256 +</PRE> + +<P> + +We used <CODE>256</CODE> but you can tune it for your own setup. In +many cases, however, even the default value of <CODE>128</CODE> (for +later versions of FreeBSD) is OK. <P>
