Date: Wed, 26 Dec 2007 08:09:49 -0500 From: Scott Long <scottl@samsco.org> To: Adrian Chadd <adrian@freebsd.org> Cc: Brett Glass <brett@lariat.net>, stable@freebsd.org Subject: Re: SMP on FreeBSD 6.x and 7.0: Worth doing? Message-ID: <4772529D.9010805@samsco.org> In-Reply-To: <d763ac660712241820s38237d99x1243862095780dc6@mail.gmail.com> References: <200712220531.WAA09277@lariat.net> <476FBED0.2080400@samsco.org> <200712241549.IAA19650@lariat.net> <476FDA10.4060107@samsco.org> <200712241653.JAA20845@lariat.net> <476FE868.8080704@samsco.org> <200712241756.KAA21950@lariat.net> <d763ac660712241820s38237d99x1243862095780dc6@mail.gmail.com>
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Adrian Chadd wrote: > On 25/12/2007, Brett Glass <brett@lariat.net> wrote: >>> It sounds like you're pretty convinced you know what the problem is. >> Again, I'd have to instrument either the FreeBSD kernel or Squid to >> be 100% sure. But it APPEARS that it's a problem with large >> numbers of threads trying to do file I/O simultaneously and blocking. > > I'd still check the namei cache; Squid can and does chew through > stupid amounts of pathnames. Its why I hacked up that "ifs" thing a > few years ago but was suddenly (contractually) required to not hack on > caching for a while.. > Yes, Squid is the ideal application for IFS. Do you still have any of your work on this, and would you be able to share it? Scott
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