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    Subject2.5.47 scheduler problems?

    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.

    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)


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