Re: -mm seems significanty slower than mainline on kernbench

[Peter Williams <pwil3058@bigpond.net.au>]

Martin Bligh wrote:
> > Thanks and looks like the results are in from 2.6.14-rc2-mm1 with the 
> > patch backed out.
> >
> > Drumroll....
> >
> > http://test.kernel.org/perf/kernbench.moe.png
> >
> > The performance goes back to a range similar to 2.6.14-rc1-mm1 (see 
> > 2.6.14-rc2-mm1 + 20328 in blue). Unfortunately this does implicate 
> > this patch. Can we put it back into -mm only and allow Peter's 
> > tweaks/fixes to go on top and have it tested some more before going 
> > upstream?
>
>
> Hmm. Looks like we didn't get this as fixed up as I thought. Moe seems 
> to be fixed (16x NUMA-Q), but elm3b132 is not (it's 4x, flat SMP ia32).
> Look at the latest graphs ....
>
> Is it possible it only got fixed for NUMA boxes?

It should be totally independent.

But anyhow, I can't see the problem.  The only numbers that I can see 
for 2.6.16-rc1-mm[1|2] (which are the ones with the latest fix) on this 
graph are approx. 101 which is much the same as the best of the rest. 
Or have I missed something?

Peter
--
Peter Williams                                   pwil3058@bigpond.net.au

"Learning, n. The kind of ignorance distinguishing the studious."
 -- Ambrose Bierce
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