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    SubjectRe: [BENCHMARK] 2.4.{18,19{-ck9},20rc1{-aa1}} with contest
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    On Sat, 2002-11-09 at 07:09, Con Kolivas wrote:
    > -----BEGIN PGP SIGNED MESSAGE-----
    > Hash: SHA1
    >
    >
    > >On Sat, Nov 09 2002, Con Kolivas wrote:
    > >> >You're showing a big shift in behaviour between 2.4.19 and 2.4.20-rc1.
    > >> >Maybe it doesn't translate to worsened interactivity. Needs more
    > >> >testing and anaysis.
    > >>
    > >> Sounds fair enough. My resources are exhausted though. Someone else have
    > >> any thoughts?
    > >
    > >Try setting lower elevator passover values. Something ala
    > >
    > ># elvtune -r 64 /dev/hda
    > >
    > >(or whatever your drive is)
    >
    > Heres some more data:
    >
    > io_load:
    > Kernel [runs] Time CPU% Loads LCPU% Ratio
    > 2.4.20-rc1 [2] 1142.2 6 90 10 16.00
    > 2420rc1r64 [3] 575.0 12 43 10 8.05
    >
    > That's it then. Should I run a family of different values and if so over what
    > range?
    >


    There is more going on than this, XFS suffered a major slowdown in some
    metadata write only benchmarks - the file create/delete phase of
    bonnie++. Now thats a single app only doing writes. Slowdown on the
    order of 500% to 600%. Since we did not follow the pre kernels in
    2.4.20 we do not really know when it was introduced and there is
    a possibility XFS itself has not followed some api change.

    Steve



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