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    SubjectRe: [patch] "HT scheduler", sched-2.5.63-B3
    Linus Torvalds <torvalds@transmeta.com> wrote:
    >
    >
    > ===== kernel/sched.c 1.161 vs edited =====
    > --- 1.161/kernel/sched.c Thu Feb 20 20:33:52 2003
    > +++ edited/kernel/sched.c Wed Mar 5 19:09:45 2003
    > @@ -337,8 +337,15 @@
    > * boost gets as well.
    > */
    > p->sleep_avg += sleep_time;
    > - if (p->sleep_avg > MAX_SLEEP_AVG)
    > + if (p->sleep_avg > MAX_SLEEP_AVG) {
    > + int ticks = p->sleep_avg - MAX_SLEEP_AVG + current->sleep_avg;
    > p->sleep_avg = MAX_SLEEP_AVG;
    > + if (ticks > MAX_SLEEP_AVG)
    > + ticks = MAX_SLEEP_AVG;
    > + if (!in_interrupt())
    > + current->sleep_avg = ticks;
    > + }
    > +
    > p->prio = effective_prio(p);
    > }
    > enqueue_task(p, array);

    This improves the X interactivity tremendously. I went back to 2.5.64 base
    just to verify, and the difference was very noticeable.

    The test involved doing the big kernel compile while moving large xterm,
    mozilla and sylpheed windows about. With this patch the mouse cursor was
    sometimes a little jerky (0.1 seconds, perhaps) and mozilla redraws were
    maybe 0.5 seconds laggy.

    So. A big thumbs up on that one. It appears to be approximately as
    successful as sched-2.5.64-a5.

    Ingo's combo patch is better still - that is sched-2.5.64-a5 and your patch
    combined (yes?). The slight mouse jerkiness is gone and even when doing
    really silly things I cannot make it misbehave at all. I'd handwavingly
    describe both your patch and sched-2.5.64-a5 as 80% solutions, and the combo
    95%.


    So I'm a happy camper, and will be using Ingo's combo patch. But I do not
    use XMMS and xine and things like that - they may be running like crap with
    these patches. I do not know, and I do not have a base to compare against
    even if I could work out how to get them going.


    I did spend a bit of time a while back trying to come up with some
    combination of tests which would exhibit this problem, and which would allow
    it to be measured and tweaked. It was unsuccessful - the peculiar
    combination of a compilation and X seems to bring it out.


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