Re: %cpu in system - squid performance in FreeBSD 5.3

From: Jeff Behl (jbehl_at_fastclick.com)
Date: 12/07/04

  • Next message: Akhthar Parvez. K: "Memory issues:-(" 
    Date: Tue, 07 Dec 2004 09:17:24 -0800
To: Sean Chittenden <sean@chittenden.org>

    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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