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    SubjectRe: [RFC PATCH] check_preempt_tick should not compare vruntime with wall time
    * Linus Torvalds (torvalds@linux-foundation.org) wrote:
    > On Mon, Sep 13, 2010 at 10:45 AM, Mathieu Desnoyers
    > <mathieu.desnoyers@efficios.com> wrote:
    > >
    > > FWIW, Xorg and firefox feel _much more_ responsive with the fix I propose when
    > > running with a make -j10. The system is even usable with a make -j20 on my UP
    > > machine, even though I can start feeling a some lag. This is probably a more
    > > important, yet less scientific, result.
    >
    > I'll test that myself (but in a bit - I need to go do voter
    > registration and socsec update first, though - I became a US citizen
    > last week).

    Congratulations!

    > Because yes, that's the reason I'm personally interested in your
    > scheduler latency work: I think our X behavior under load is pitiful
    > (I do "make -j16" on my dual-core with HT Core i5, and web browsong
    > shouldn't start to lag as much as it does just because I overcommit
    > the CPU a bit). So if this makes a noticeable difference, I think it's
    > very important.

    Please make sure to include the "smaller min_granularity" patch in your test
    too, because the "check_preempt_tick" fix seems to only affect threads with
    non-zero nice value. I suspect that most of the responsiveness improvement I got
    is mainly from lowering the min_granularity.

    Thanks,

    Mathieu

    --
    Mathieu Desnoyers
    Operating System Efficiency R&D Consultant
    EfficiOS Inc.
    http://www.efficios.com


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