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    SubjectRe: 2.5.47 scheduler problems?
    Date

    ----- Original Message -----
    From: "Tim Connors" <tconnors@astro.swin.edu.au>
    To: <linux-kernel@vger.kernel.org>; "Mike Galbraith" <efault@gmx.de>
    Sent: Monday, November 18, 2002 7:51 AM
    Subject: Re: 2.5.47 scheduler problems?


    > 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?

    I have neither the need for 30 CPUs, nor the cash to pay for such a
    beast :)

    I gather you think my test is silly?

    -Mike

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