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    SubjectRe: 2.5.2-pre performance degradation on an old 486

    On Mon, 7 Jan 2002, Matthias Hanisch wrote:
    >
    > To answer your question, I wanted to profile 2.5.2-pre8 against
    > 2.5.2-pre8-old-scheduler. _Fortunately_ I made some mistake and forgot to
    > back out the following chunk of memory.
    >
    > --- v2.5.1/linux/arch/i386/kernel/process.c Thu Oct 4 18:42:54 2001
    > +++ linux/arch/i386/kernel/process.c Thu Dec 27 08:21:28 2001
    > @@ -125,7 +125,6 @@
    > /* endless idle loop with no priority at all */
    > init_idle();
    > current->nice = 20;
    > - current->counter = -100;
    >
    > while (1) {
    > void (*idle)(void) = pm_idle;

    Hey, that would do it. It looks like the idle task ends up being a
    _normal_ process (just nice'd down), so it will get real CPU time instead
    of only getting scheduled when nothing else is runnable.

    Davide, I think the bounce-buffer is a red herring, it's simply that we're
    wasting time in idle..

    Linus

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