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    SubjectRe: CFS review

    * Mike Galbraith <efault@gmx.de> wrote:

    > > Thanks for the testing and the feedback, it's much appreciated! :-)
    > > On what platform did you do your tests, and what .config did you use
    > > (and could you please send me your .config)?
    > >
    > > Please also send me the output of this script:
    > >
    > > http://people.redhat.com/mingo/cfs-scheduler/tools/cfs-debug-info.sh
    > >
    > > (if the output is too large send it to me privately, or bzip2 -9
    > > it.)
    > >
    > > Could you also please send the source code for the "l.c" and "lt.c"
    > > apps you used for your testing so i can have a look. Thanks!
    >
    > I haven't been able to reproduce this with any combination of
    > features, and massive_intr tweaked to his work/sleep cycle. I notice
    > he's collecting stats though, and they look funky. Recompiling.

    yeah, the posted numbers look most weird, but there's a complete lack of
    any identification of test environment - so we'll need some more word
    from Roman. Perhaps this was run on some really old box that does not
    have a high-accuracy sched_clock()? The patch below should simulate that
    scenario on 32-bit x86.

    Ingo

    Index: linux/arch/i386/kernel/tsc.c
    ===================================================================
    --- linux.orig/arch/i386/kernel/tsc.c
    +++ linux/arch/i386/kernel/tsc.c
    @@ -110,7 +110,7 @@ unsigned long long native_sched_clock(vo
    * very important for it to be as fast as the platform
    * can achive it. )
    */
    - if (unlikely(!tsc_enabled && !tsc_unstable))
    +// if (unlikely(!tsc_enabled && !tsc_unstable))
    /* No locking but a rare wrong value is not a big deal: */
    return (jiffies_64 - INITIAL_JIFFIES) * (1000000000 / HZ);

    -
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