Re: [RELENG_6] idle thread statistics not correct?

From: John Baldwin (jhb_at_FreeBSD.org)
Date: 08/12/05

  • Next message: Michael Nottebrock: "Re: [RELENG_6] idle thread statistics not correct?" 
    To: freebsd-current@freebsd.org
Date: Fri, 12 Aug 2005 09:43:28 -0400

    On Friday 12 August 2005 05:38 am, Xin LI wrote:
    > Hi, all,
    >
    > I got into a strange issue on a remote box I just upgraded to RELENG_6.
    >
    > [delphij@www] ~> ps aux | grep idle | grep -v grep
    > root 11 92.5 0.0 0 8 ?? RL Thu03AM 0:00.00 [idle:
    > cpu3] root 13 92.5 0.0 0 8 ?? RL Thu03AM 2293:59.13
    > [idle: cpu1] root 12 70.7 0.0 0 8 ?? RL Thu03AM
    > 2300:52.77 [idle: cpu2] root 14 27.8 0.0 0 8 ?? RL
    > Thu03AM 2292:59.84 [idle: cpu0]
    >
    > However, if I set machdep.hlt_logical_cpus=0, the ps aux output looks more
    > rational:
    >
    > [delphij@www] ~> ps aux | grep idle | grep -v grep
    > root 11 92.5 0.0 0 8 ?? RL Thu03AM 2307:08.09 [idle:
    > cpu3] root 13 81.2 0.0 0 8 ?? RL Thu03AM 2306:58.61
    > [idle: cpu1] root 12 57.1 0.0 0 8 ?? RL Thu03AM
    > 2304:56.66 [idle: cpu2] root 14 39.1 0.0 0 8 ?? RL
    > Thu03AM 2294:48.68 [idle: cpu0]
    >
    > I have not looked into this deeply yet, but I think this really looks weird
    > and may indicate other issues.

    [ Grrr, stupid kmail "smart" quoting always screws up formatted output, wish I
    could turn it off ]

    The idle CPUs are idle in such a way that they don't update their stats is
    all. It's not an indication of any other issues, it's simply an accounting
    error in that one edge case. I can look into fixing it but since it's just
    cosmetic, it's fairly low on the priority list. 

    -- 
John Baldwin <jhb@FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org
_______________________________________________
freebsd-stable@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-stable
To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org"
  • Next message: Michael Nottebrock: "Re: [RELENG_6] idle thread statistics not correct?"