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    SubjectRe: unusual scheduling performance
    > On 16x, 2.5.47 kernel compiles take about 26s when the machine is
    > otherwise idle.
    >
    > On 32x, 2.5.47 kernel compiles take about 48s when the machine is
    > otherwise idle.
    >
    > When a single-threaded task consumes an entire cpu, kernel compiles
    > take 36s on 32s when the machine is idle aside from the task consuming
    > that cpu and the kernel compile itself.
    >
    > I suspect the scheduler, because cpu reporting in top(1) shows that a
    > two or more cpu-intensive tasks are concentrated on the same cpu, and
    > some long-lived tasks appear to be "bouncing" across cpus. If someone
    > with knowledge and/or expertise with respect to scheduling semantics
    > could look into this, I would be much obliged. Resolving this would
    > likely address many SMP and/or NUMA scheduling performance issues.

    1. make -j <what?>

    2. profiles?

    3. Can you try the latest set of NUMA sched patches posted by Eric Focht?

    M.

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