Messages in this thread | | | Date | Mon, 7 Jan 2002 19:01:15 +0100 (MET) | From | Mikael Pettersson <> | Subject | Re: 2.5.2-pre performance degradation on an old 486 |
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On Mon, 7 Jan 2002 08:43:04 -0800 (PST), Linus Torvalds wrote: >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..
This does seem to be the case. As a quick hack I added
if (p == &init_task) return -50;
at the start of kernel/sched.c:goodness() [to approximate the old scheduler's behaviour], and this immediately restored performance on my 486 to the old scheduler's levels.
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