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    SubjectRe: [PATCH] 2.5.72 O(1) interactivity bugfix
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    On Wed, 2003-06-18 at 10:43, Con Kolivas wrote: 
    > --BEGIN PGP SIGNED MESSAGE--
    > Hash: SHA1
    >
    > Hi Ingo, all
    >
    > While messing with the interactivity code I found what appears to be an
    > uninitialised variable (p->sleep_avg), which is responsible for all the
    > boost/penalty in the scheduler. Initialising this variable to 0 seems to have
    > made absolutely massive improvements to system responsiveness under load
    > and completely removed audio skips up to doing a make -j64 on my uniprocessor
    > P4 (beyond which swap starts being used), without changing the scheduler
    > timeslices. This seems to help all 2.4 O(1) based kernels as well. Attached
    > is a patch against 2.5.72 but I'm not sure about the best place to initialise
    > it.

    Applying this ontop of 2.5.72-mm1 causes more xmms/mpg321/ogg123
    skipping than with plain -mm1 here. make -j20 on my up athlon 1900+ with
    512M ram causes extreme skipping until the make is killed. With plain
    -mm1 I may get _one_ skip at the very begining of a song during make
    -j20 (about 50% of the time). Plain -mm1 stops skipping after 10-15 sec
    of playback of a song, and even switching desktops after that doesnt
    cause skips, with or without make -j20 running (switching to/from
    desktops with apps like mozilla, evolution etc. will cause skips during
    the first 10-15 sec of a song regardless what I do it seems).

    Renicing xmms to -15 doesnt change anything with either kernel.

    Andreas


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