Re: -mm seems significanty slower than mainline on kernbench

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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                                   [email protected]

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