Date: Tue, 21 Jan 2003 19:54:29 -0500 From: Mike Tancsa <mike@sentex.net> To: Jim Weeks <jim@jwweeks.com> Cc: freebsd-isp@freebsd.org Subject: Re: tuning suggestions? Message-ID: <aoqr2v4qoo0udl5dk3uusoctvbpivc6mn9@4ax.com> In-Reply-To: <mailman.1043163721.4591.fisp-l@lists.sentex.ca> References: <mailman.1043163721.4591.fisp-l@lists.sentex.ca>
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On Tue, 21 Jan 2003 10:41:00 -0500 (EST), in sentex.lists.freebsd.isp you wrote: >Hi, > >Shortly after making world, striping the kernel, upgrading apache, >and installing WebGUI on a couple of websites (WebGUI requires >mod_perl to preload Apache::Registry), I began to get these two >errors. > >pmap_collect: collecting pv entries -- suggest increasing >PMAP_SHPGPERPROC microuptime() went backwards (613878.982533 -> >613874.389277) > >This machine sees fairly heavy MySql use and moderate httpd load. >It has been faithfully doing its job for a couple of years now from >3.0 - 4.7-stable and has never given a problem. I have read man >tuning, LINT, and searched the archives on these two errors and >really haven't come up with a lot of information. The following >lines from lint are sketchy at best. > >------------------------- ># If you're tweaking this, you might also want to increase the >sysctls # "vm.v_free_min", "vm.v_free_reserved", and "vm.v_free_target". ># # The value below is the one more than the default. # options >PMAP_SHPGPERPROC=3D201 >------------------------- > >Could upping PMAP_SHPGPERPROC by 1 actually be that beneficial? >And, could removing apm from the kernel have caused the microuptime >problem? I am pasting in dmesg system information for reference. I would get rid of APM yes, and increase PMAP_SHPGPERPROC. Lint is = saying the default is 200. It was a few months ago and I forget how I arrived at the number, but we saw the same thing on a busy apache/mySQL server so we increased the value to 400 and the problem went away. There is 768MB of RAM on that box. ---Mike Mike Tancsa (mike@sentex.net)=09 http://www.sentex.net/mike To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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