Date: Thu, 06 Dec 2007 15:06:03 +0100 From: Patrick van Iersel <pviersel@office.caiw.nl> To: Dennis Berger <db@nipsi.de> Cc: freebsd-stable@freebsd.org, Jeremy Chadwick <koitsu@FreeBSD.org>, Eugene Grosbein <eugen@kuzbass.ru> Subject: Re: Extreme load with local password db lookups Message-ID: <C37DC05B.396B0%pviersel@office.caiw.nl> In-Reply-To: <4757E667.1090409@nipsi.de>
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> > 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). >> > From: Dennis Berger <db@nipsi.de> > Date: Thu, 06 Dec 2007 13:09:11 +0100 > To: Jeremy Chadwick <koitsu@FreeBSD.org> > Cc: Eugene Grosbein <eugen@kuzbass.ru>, Patrick van Iersel > <pviersel@office.caiw.nl>,freebsd-stable@freebsd.org > Subject: Re: Extreme load with local password db lookups > > 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 Ok, thanks for the suggestions. I'm a little low on time right now (who isn't) but I'll work on these next week. Best regards, Patrick.
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