Re: 2.6.8-rc2-mm2

[Ingo Molnar]

* Con Kolivas <kernel@xxxxxxxxxxx> wrote:

> Ingo Molnar writes:
> 
> Thanks for replying.
> 
> >* Nick Piggin <nickpiggin@xxxxxxxxxxxx> wrote:
> >
> >>Also, basic interactivity in X is bad with the interactive sysctl set
> >>to 0 (is X supposed to be at nice 0?), however fairness is bad when
> >>interactive is 1. I'm not sure if this is an acceptable tradeoff - are
> >>you planning to fix it?
> >
> >it also has clear interactivity problems when just running lots of CPU
> >hogs even with the default interactive=1 compute=0 setting.
> 
> Can you define them please? I haven't had any reported to me.

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.

unapply staircase-cpu-scheduler-268-rc2-mm1.patch and the same workload
becomes usable.

	Ingo
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