Re: sched domains kernbench improvements

From: Con Kolivas (kernel_at_kolivas.org)
Date: 02/28/04

  • Next message: Kliment Yanev: "Nokia c110 driver" 
    To: Nick Piggin <piggin@cyberone.com.au>
Date:	Sat, 28 Feb 2004 23:27:15 +1100

    On Sat, 28 Feb 2004 22:23, Nick Piggin wrote:
    > Con Kolivas wrote:
    > >Will this affect the SCHED_SMT performance and should I do a round of
    > > benchies with this enabled?
    >
    > It will as far as balancing between physical CPUs, yes. It probably
    > doesn't make quite a big difference because it is less of a problem
    > if one sibling goes idle than if one CPU (in the 8-way) goes idle).
    >
    > But if you could do a round with SCHED_SMT enabled it would be very
    > nice of you ;)

    One wonders sometimes why one asks a question if one already knows the
    answer ;-)

    better on half load

    sched_SMT:
    Average Half Load Run:
    Elapsed Time 113.008
    User Time 742.786
    System Time 90.65
    Percent CPU 738
    Context Switches 28062.6
    Sleeps 24571.8

    Average Optimum Load Run:
    Elapsed Time 79.278
    User Time 1007.69
    System Time 107.388
    Percent CPU 1407
    Context Switches 33355
    Sleeps 32720

    Average Maximum Load Run:
    Elapsed Time 80.33
    User Time 1009.89
    System Time 121.518
    Percent CPU 1408.4
    Context Switches 31802.4
    Sleeps 22905

    sched_SMT-lessidle:
    Average Half Load Run:
    Elapsed Time 112.084
    User Time 722.972
    System Time 91.946
    Percent CPU 727.2
    Context Switches 13016.6
    Sleeps 24991.2

    Average Optimum Load Run:
    Elapsed Time 79.07
    User Time 1007.33
    System Time 107.482
    Percent CPU 1410.2
    Context Switches 33007.2
    Sleeps 32159.6

    Average Maximum Load Run:
    Elapsed Time 80.926
    User Time 1010.12
    System Time 121.472
    Percent CPU 1399
    Context Switches 31268.4
    Sleeps 22479

    Con
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