Re: -mm seems significanty slower than mainline on kernbench

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Peter Williams wrote:
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?

Oops. I was looking at the graphs for Moe but <http://test.kernel.org/perf/dbench.elm3b132.png> doesn't appear to be demonstrating a problem either. Given the fluctuation in the 2.6.16-rc1 results (235, 234, 211, 228.5 and 237.5), the results for 2.6.16-rc1-mm1 (229) and 2.6.16-mm2 (219) aren't significantly different.

Peter
PS I have a modification for kernbench that calculates and displays the standard deviations for the various averages if you're interested. This would enable you to display 95% (say) confidence bars on the graphed results which in turn makes it easier to spot significant differences.
--
Peter Williams                                   [email protected]

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