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    SubjectRe: [PATCH] O3int interactivity for 2.5.74-mm2
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    On Sun, 2003-07-06 at 19:16, Con Kolivas wrote:
    > -----BEGIN PGP SIGNED MESSAGE-----
    > Hash: SHA1
    >
    > Attached is an incremental patch against 2.5.74-mm2 with more interactivity
    > work. Audio should be quite resistant to skips with this, and it should not
    > induce further unfairness.
    >
    > Changes:
    > The sleep_avg buffer was not needed with the improved semantics in O2int so it
    > has been removed entirely as it created regressions in O2int.
    >
    > A small change to the idle detection code to only make tasks with enough
    > accumulated sleep_avg become idle.
    >
    > Minor cleanups and clarified code.
    >
    >
    > Other issues:
    > Jerky mouse with heavy page rendering in web browsers remains. This is a
    > different issue to the audio and will need some more thought.
    >
    > The patch is also available for download here:
    > http://kernel.kolivas.org/2.5
    >
    > Note for those who wish to get smooth X desktop feel now for their own use,
    > the granularity patch on that website will do wonders on top of O3int, but a
    > different approach will be needed for mainstream consumption.

    I'm seeing extreme X starvation with this patch under 2.5.74-mm2 when
    starting a CPU hogger:

    1. Start a KDE session.
    2. Launch a Konsole
    3. Launch Konqueror
    4. Launch XMMS
    5. Make XMMS play an MP3 file
    6. On the Konsole terminal, run "while true; do a=2; done"

    When the "while..." is run, X starves completely for ~5 seconds (e.g.
    the mouse cursor doesn't respond to my input events). After those 5
    seconds, the mouse cursor goes jerky for a while (~2 seconds) and then
    the system gets responsive.

    PS: There are no user processes reniced.

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