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    SubjectRe: [patch] CFS scheduler, -v8

    * Mike Galbraith <> wrote:

    > On Tue, 2007-05-01 at 23:22 +0200, Ingo Molnar wrote:
    > > - interactivity: precise load calculation and load smoothing
    > This seems to help quite a bit.

    great :)

    > (5 second top sample)
    > 2636 root 15 -5 19148 15m 5324 R 73 1.5 1:42.29 0 amarok_libvisua
    > 5440 root 20 0 320m 36m 8388 S 18 3.6 3:28.55 1 Xorg
    > 4621 root 20 0 22776 18m 4168 R 12 1.8 0:00.63 1 cc1
    > 4616 root 20 0 19456 13m 2200 R 9 1.3 0:00.43 0 cc1
    > I no longer have to renice both X and Gforce to achieve a perfect
    > display when they are sharing my box with a make -j2. X is displaying
    > everything it's being fed beautifully with no help. I have to renice
    > Gforce (amarok_libvisual), but given it's very heavy CPU usage, that
    > seems perfectly fine.

    ah! Besides OpenGL behavior and app startup performance i didnt
    originally have Xorg in mind with this change, but thinking about it,
    precise load calculations and load smoothing does have a positive effect
    on 'coupled' workloads where under the previous variant of CFS's load
    calculation one task component of the workload could become 'invisible'
    to another task and hence cause macro-scale scheduling artifacts not
    expected by humans. With smoothing these are dealt with more
    consistently. Xorg can be a quite strongly coupled workload.

    > No regressions noticed so far. Box is _very_ responsive under load,
    > seemingly even more so than with previous releases. That is purely
    > subjective, but the first impression was very distinct.

    yeah, make -jN workloads (and any mixture of non-identical scheduling
    patterns, which most real workloads consist of) should be handled more
    consistently too by -v8.

    so your workload (and Gene's workload) were the ones in fact that i had
    hoped not to _hurt_ with -v8 (neither of you being the hardcore gamer
    type ;), and in reality -v8 ended up helping them too. These sorts of
    side-effects are always welcome ;-)

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