From owner-freebsd-stable@FreeBSD.ORG Wed Dec 26 13:09:54 2007 Return-Path: Delivered-To: stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 865B116A41A for ; Wed, 26 Dec 2007 13:09:54 +0000 (UTC) (envelope-from scottl@samsco.org) Received: from pooker.samsco.org (pooker.samsco.org [168.103.85.57]) by mx1.freebsd.org (Postfix) with ESMTP id 4778913C461 for ; Wed, 26 Dec 2007 13:09:54 +0000 (UTC) (envelope-from scottl@samsco.org) Received: from scoo-longs-computer.local (pooker.samsco.org [168.103.85.57]) (authenticated bits=0) by pooker.samsco.org (8.13.8/8.13.8) with ESMTP id lBQD9nac054969; Wed, 26 Dec 2007 06:09:50 -0700 (MST) (envelope-from scottl@samsco.org) Message-ID: <4772529D.9010805@samsco.org> Date: Wed, 26 Dec 2007 08:09:49 -0500 From: Scott Long User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US; rv:1.8.1.11) Gecko/20071128 SeaMonkey/1.1.7 MIME-Version: 1.0 To: Adrian Chadd 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> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH authentication, not delayed by milter-greylist-2.0.2 (pooker.samsco.org [168.103.85.57]); Wed, 26 Dec 2007 06:09:51 -0700 (MST) X-Spam-Status: No, score=-1.4 required=5.4 tests=ALL_TRUSTED autolearn=failed version=3.1.8 X-Spam-Checker-Version: SpamAssassin 3.1.8 (2007-02-13) on pooker.samsco.org Cc: Brett Glass , stable@freebsd.org Subject: Re: SMP on FreeBSD 6.x and 7.0: Worth doing? X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 26 Dec 2007 13:09:54 -0000 Adrian Chadd wrote: > On 25/12/2007, Brett Glass 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