Date: Mon, 15 Dec 2008 17:29:03 -0500 From: Paul MacKenzie <bsdlist@cogeco.ca> To: freebsd-stable@freebsd.org Subject: Re: 7.1-PRERELEASE: arcmsr write performance problem Message-ID: <4946DA2F.7090508@cogeco.ca> In-Reply-To: <200812152035.mBFKZkj4084689@lava.sentex.ca> References: <2515BCEE3A2F4CBA8FFB9F1C052924AA@jmlaptop> <4934CB77.30906@transactionware.com> <494698E4.2070406@cogeco.ca> <200812151900.mBFJ0Jom084267@lava.sentex.ca> <4946B6EF.5080806@cogeco.ca> <200812152010.mBFKAlZf084580@lava.sentex.ca> <4946BDB1.8060208@cogeco.ca> <200812152035.mBFKZkj4084689@lava.sentex.ca>
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> I would try the change to /etc/nsswitch.conf so that group and passwd > read > > group: files > passwd: files > > At that file size, it sounds like you only have about 200 entries ? I > doubt its the issue, but its worth a try. I know at around 9,000 > files anything to do with UID lookups (e.g. ls -l) takes forever. > > >> PID USERNAME VCSW IVCSW READ WRITE FAULT TOTAL PERCENT >> COMMAND >> 54 root 2 0 0 7 0 7 100.00% >> syncer > > Do you have any other special tuning other than polling ? Any in > /boot/loader.conf or /etc/sysctl.conf ? > > Does gstat show the disks busy ? > > ---Mike > The next thing I am doing is going to be removing the QUOTA feature to see if this has any bearing on this problem. It does not appear to be even writing at a heavy load as you can see (almost nothing) but the processes are mostly in UFS when it spirals out of control. I moved the processing of amavisd-new into a memory drive to at least take that off the IO and this seems to have helped a bit. There is not a lot of mail going through the system but every little bit helps. I suspect this is one other reason that is bringing the problem to the forefront as amavisd-new can use the disks a bit to process each e-mail. Thanks for your help so far, Paul
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