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    From
    SubjectRe: 2.5.47 scheduler problems?
    Date
    In linux.kernel, you wrote:
    > Greetings,
    >
    > For testing swap throughput, I like to run make -j30 bzImage on my 500Mhz
    > PIII w. 128Mb ram. For testing interactivity, I fire up KDE, start a
    > smaller make -j, grab a window, and wave it around.
    >
    > With 2.4.20rc2+rc1aa1, running a -j10 build (not swapping) is very very
    > bad. However, if I set all tasks in the system to SCHED_FIFO or SCHED_RR
    > prior to this light make -j, I have a ~pretty smooth system.
    >
    > If I do the same in 2.5.47, I have no control of my box. Setting all tasks
    > to SCHED_FIFO or SCHED_RR prior to starting make -j10 bzImage, I can regain
    > control, but interactivity under load is basically not present.

    Funny that.

    > I used to be able to wave a window poorly at make -j25 (swapping heftily),
    > fairly smoothly at make -j20, and smoothly at make -j15 or below. This
    > with no SCHED_RR/SCHED_FIFO. (I haven't done much testing like this in
    > quite a while though)

    Perhaps you should consider buying an extra 29 CPU's for you desktop?

    --
    TimC -- http://astronomy.swin.edu.au/staff/tconnors/

    A Chemist who falls in acid is absorbed in work.

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