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    SubjectRe: VolanoMark performance improvements (was: Re: volanoMark 12% regression with 2.6.25-rc6)
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    On Fri, 2008-03-21 at 15:14 +0800, Zhang, Yanmin wrote:
    > On Thu, 2008-03-20 at 09:35 +0800, Zhang, Yanmin wrote:
    > > On Wed, 2008-03-19 at 14:48 +0100, Ingo Molnar wrote:
    > > > i just tried a handful of kernels with VolanoMark on an Intel quad-core
    > > > testbox,
    > > How many physical processors does it have?
    > > > these numbers are totally reproducible when running them over a long
    > > > time, i only included 6 runs for brevity. (A sidenote: the
    > > > /proc/sys/kernel/compat_sched_yield switch of 0 or 1 has no effect on
    > > > the .25-rc7 results, and it degraded the .24 results by about 35% so i
    > > > kept it off there.)
    > I used java-openjdk to test it with 2.6.25-rc5 by switching compat_sched_yield
    > to 0/1. The result difference is about 30%.
    >
    > vmstat data when compat_sched_yield=0:
    > procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
    > r b swpd free buff cache si so bi bo in cs us sy id wa st
    > 85 0 0 7584984 17128 79264 0 0 0 0 2 716494 37 60 3 0 0
    > 94 0 0 7585168 17136 79256 0 0 0 64 7 723299 39 57 4 0 0
    >
    >
    > vmstat data when compat_sched_yield=0:
    Sorry. below data is when compat_sched_yield=1:

    > procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
    > r b swpd free buff cache si so bi bo in cs us sy id wa st
    > 369 0 0 7580656 14364 75852 0 0 0 0 4 1013260 42 57 1 0 0
    > 335 0 0 7580836 14364 75852 0 0 0 0 1 971081 41 58 1 0 0
    > 414 0 0 7580932 14372 75852 0 0 0 64 7 955333 40 58 1 0 0




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