Messages in this thread | | | Date | Tue, 24 Jan 2006 14:50:08 +1100 | From | Peter Williams <> | Subject | 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 pwil3058@bigpond.net.au
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