Re: 2.6.8-rc2-mm2

From: Ingo Molnar
Date: Thu Aug 05 2004 - 07:54:26 EST

* Con Kolivas <kernel@xxxxxxxxxxx> wrote:

> >sure: take a process that uses 85% of CPU time (and sleeps 15% of the
> >time) if running on an idle system. Start just two of these hogs at
> >normal priority. 2.6.8-rc2-mm2 becomes almost instantly unusable even
> >over a text console: a single 'top' refresh takes ages, 'ls' displays
> >one line per second or so. Start more of these and the system
> >effectively locks up.
> It's only if I physically try and create such a test application that
> I can reproduce it. I haven't found any real world load that does that
> - but of course that doesn't mean I should discount it. However,
> interactive mode off doesn't exhibit it and it should be easy enough
> to fix for interactive mode on. Thanks for pointing it out.

cool. Will be curious how it will look like once staircase-sched gets
its time-shared slot in -mm next time around :-) But in general i'm
quite positive about the staircase scheduler.

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