Date: Tue, 07 Dec 2004 09:17:24 -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: <41B5E5A4.6060407@fastclick.com> In-Reply-To: <E338B57E-44CD-11D9-86BB-000A95C705DC@chittenden.org> References: <41AE651F.3040104@fastclick.com> <E338B57E-44CD-11D9-86BB-000A95C705DC@chittenden.org>
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I upgraded to STABLE but most cpu time is still being spent in system. This system is doing ~20Mb/s total with all content being grabbed out of memory. I see similar results when running MySQL (a lot of time being spent in system) Any ideas on what updates to be on the lookout for that might help with this? Am I right in guessing that this is a SMP issue and doesn't have anything to do with AMD architecture? thx FreeBSD www2 5.3-STABLE FreeBSD 5.3-STABLE #2: Sun Dec 5 21:06:14 PST 2004 root@www2.cdn.sjc:/usr/obj/usr/src/sys/SMP amd64 last pid: 15702; load averages: 0.15, 0.31, 0.31 up 0+19:55:14 09:09:28 38 processes: 2 running, 36 sleeping CPU states: 5.4% user, 0.0% nice, 12.7% system, 3.4% interrupt, 78.4% idle Mem: 163M Active, 284M Inact, 193M Wired, 72K Cache, 214M Buf, 1245M Free Swap: 4069M Total, 4069M Free PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU CPU COMMAND 486 squid 96 0 79820K 73996K CPU1 1 110:00 15.04% 15.04% squid 480 squid 96 0 75804K 70012K select 0 105:56 14.89% 14.89% squid Sean Chittenden wrote: >> but the % system time can fluctuate up to 60 at times. My question is >> if this is about the type of performance I could expect, or if people >> have seen better. > > > I don't know about other people, but I suspect you're running into > lock contention. Try using a post 5.3 snapshot (something from > RELENG_5) since alc@ has set debug.mpsafevm=1, which lets many calls > to the VM run without GIANT, which I suspect is your problem and why > the system usage is all over the place. -sc >
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