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    SubjectRe: [patch] sched-2.5.59-A2

    On Sun, 19 Jan 2003, Erich Focht wrote:

    > The results:
    > - kernbench UserTime is best for the 2.5.59 scheduler (623s). IngoB0
    > best value 627.33s for idle=20ms, busy=2000ms.
    > - hackbench: 2.5.59 scheduler is significantly better for all
    > measurements.
    >
    > I suppose this comes from the fact that the 2.5.59 version has the
    > chance to load_balance across nodes when a cpu goes idle. No idea what
    > other reason it could be... Maybe anybody else?

    this shows that agressive idle-rebalancing is the most important factor. I
    think this means that the unification of the balancing code should go into
    the other direction: ie. applying the ->nr_balanced logic to the SMP
    balancer as well.

    kernelbench is the kind of benchmark that is most sensitive to over-eager
    global balancing, and since the 2.5.59 ->nr_balanced logic produced the
    best results, it clearly shows it's not over-eager. hackbench is one that
    is quite sensitive to under-balancing. Ie. trying to maximize both will
    lead us to a good balance.

    Ingo

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