Date: Thu, 06 Dec 2007 13:09:11 +0100 From: Dennis Berger <db@nipsi.de> To: Jeremy Chadwick <koitsu@FreeBSD.org> Cc: freebsd-stable@freebsd.org, Patrick van Iersel <pviersel@office.caiw.nl>, Eugene Grosbein <eugen@kuzbass.ru> Subject: Re: Extreme load with local password db lookups Message-ID: <4757E667.1090409@nipsi.de> In-Reply-To: <20071206114046.GA78813@eos.sc1.parodius.com> References: <C37D8F8E.39687%pviersel@office.caiw.nl> <20071206112207.GA74486@svzserv.kemerovo.su> <20071206114046.GA78813@eos.sc1.parodius.com>
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A common way to debug is to isolate the affected systemcalls, by using tools like ktrace or strace. Strace can also record a timestamp, you can see how long it takes to complete a specific systemcall # strace -r -f <serverproc> Do a single login and then examine the results. happy debugging. regards, Dennis Jeremy Chadwick schrieb: > On Thu, Dec 06, 2007 at 06:22:07PM +0700, Eugene Grosbein wrote: > >> On Thu, Dec 06, 2007 at 11:37:50AM +0100, Patrick van Iersel wrote: >> >> >>> Here's the situation. We have an web/ftp server with around 74000 users >>> defined in the local unix password database. On 4.9-stable which it is >>> running now, there is no noticable load when lookups are done (logins via >>> ftp, ~user lookups from apache etc.). We want to migrate this system to >>> 6-stable. >>> However on 6-STABLE (FreeBSD 6.3-PRERELEASE #0: Wed Dec 5 13:35:05 CET >>> 2007) these same lookups cause very high load and things slow down to a >>> crawl. >>> >>> Does anybody have an idea what causes this behavior? >>> >>> Thanx in advance for any insights. >>> >> Take a look to your /etc/nsswitch.conf. If you do not use NIS, >> try to change lines for 'group' and 'passwd' to look like this: >> >> group: files >> passwd: files >> > > The default value is "compat" on both RELENG_6 and RELENG_7. I don't > think switching to "files" will fix his problem (I'll be very surprised > if it does). > >
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