Date: Tue, 04 Jan 2005 10:58:27 -0800 From: Jeff Behl <jbehl@fastclick.com> To: Sean Chittenden <sean@chittenden.org> Cc: freebsd-performance@freebsd.org Subject: Re: %cpu in system - squid performance in FreeBSD 5.3 Message-ID: <41DAE753.7050800@fastclick.com> In-Reply-To: <298151B6-5527-11D9-B830-000A95C705DC@chittenden.org> References: <7632915A8F000C4FAEFCF272A880344165164F@Ehost067.exch005intermedia.net> <298151B6-5527-11D9-B830-000A95C705DC@chittenden.org>
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back from vacation... i did try STABLE, with the same results: FreeBSD www2.cdn 5.3-STABLE FreeBSD 5.3-STABLE #2: Sun Dec 5 21:06:14 PST 2004 root@www2.cdn:/usr/obj/usr/src/sys/SMP amd64 interestingly enough, i got a reply on a squid list from someone on a linux box who had similar results: - I've got a dual proc Xeon (3GHz) Linux 2.4.26 system running one squid 2.5.5 as reverse proxy without cache, I use squidguard to route different path of the same domain to different clusters. Top shows: Cpu1 : 39.3% user, 58.0% system, 0.0% nice, 2.7% idle - so perhaps this is some gross problem with squid? jeff Sean Chittenden wrote: >> As a follow up to the below (original message at the very bottom), I >> installed a load balancer in front of the machines which terminates the >> tcp connections from clients and opens up a few, persistent connections >> to each server over which requests are pipelined. In this scenario >> everything is copasetic: > > > Interesting... I wonder what the lock contention path is between the > VM and network stack. Has anyone else noticed this in their testing? > Did you try a post-5.3 release or not? rwatson@ just MFC'ed a bunch > of network locking fixes to RELENG_5, but none-stand out in my mind as > being something that'd potentially fix your issue. Actually, he > probably knows better than anyone what this could be. Some of the > post RELENG_5_3 commits by alc@ could explain this, however, and is > why I ask what the specific version/build time is for your release. -sc >
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