Date: Mon, 30 Oct 1995 12:54:53 +1030 (CST) From: Michael Smith <msmith@atrad.adelaide.edu.au> To: csw@artemis.com (chris warth) Cc: questions@freebsd.org Subject: Re: questions about 'update' Message-ID: <199510300224.MAA00463@genesis.atrad.adelaide.edu.au> In-Reply-To: <199510300208.SAA00316@scooter.artemis.com> from "chris warth" at Oct 29, 95 06:08:14 pm
next in thread | previous in thread | raw e-mail | index | archive | help
chris warth stands accused of saying: > Anyway, I played with the "update" frequency, first setting it 300 > seconds. Instead of seeing a steady 100 hits/sec then I saw a brief > initial spurt of 100 hits/sec that dropped down to a pretty steady 70 > hits/second. How much logging are you doing? > So the real question is, if update is turned off, and the disk cache is > not getting flushed, what causes the hit rate to drop by > from 100 hits/sec to 70 hits/sec after a while? Use netstat to see how many TCP connections you have in FIN_WAIT. You may be suffering a slowdown due to an enormous number of connections unclosed. > to disk? The files have all been opened "read-only". Is it spending > all of its time writing the last-accessed time in the inode?? If so > it seems a terrible waste and I'll want to turn that off to make a > really fast server. If you want to experiment with this, mount the filesystem containing the pages read-only. > -csw -- ]] Mike Smith, Software Engineer msmith@atrad.adelaide.edu.au [[ ]] Genesis Software genesis@atrad.adelaide.edu.au [[ ]] High-speed data acquisition and [[ ]] realtime instrument control (ph/fax) +61-8-267-3039 [[ ]] My car has "demand start" -Terry Lambert UNIX: live FreeBSD or die! [[
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199510300224.MAA00463>