Re: [BENCHMARK] 2.5.46-mm1 with contest

Andrew Morton (akpm@digeo.com)
Thu, 07 Nov 2002 15:58:48 -0800


Robert Love wrote:
>
> On Thu, 2002-11-07 at 17:53, Con Kolivas wrote:
>
> > io_load:
> > Kernel [runs] Time CPU% Loads LCPU% Ratio
> > 2.5.44-mm6 [3] 284.1 28 20 10 3.98
> > 2.5.46 [1] 600.5 13 48 12 8.41
> > 2.5.46-mm1 [5] 134.3 58 6 8 1.88
> >
> > Big change here. IO load is usually the one we feel the most.
>
> Nice.

Mysterious.

> > Unfortunately I've only run this with preempt enabled so far and I believe
> > many of the improvements are showing this effect.
>
> Since your aim is desktop performance, I would like it if you always ran
> with kernel preemption enabled. That is what we are targeting for
> desktop performance.

I'd be interested in average-of-five runs both with and without
preemption.

Preemption seemed to do odd things to process_load as well. gcc gained
10% and the "load" lost 40%. But the %LCPU fell only 25%, which is
probably dodgy accounting. I wonder what's up with all that.
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