Messages in this thread | | | Date | Sat, 15 Apr 2006 14:17:44 -0700 | From | Andrew Morton <> | Subject | Re: Clear performance regression on reaim7 in 2.6.15-git6 |
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"Martin J. Bligh" <mbligh@google.com> wrote: > > OK, looking back through the perf results, these two graphs clearly show > a perf regression in reaim7 from 2.6.15 to 2.6.16-rc1. We're loosing > over 50% of the performance. > > http://test.kernel.org/abat/perf/reaim.moe.png > http://test.kernel.org/abat/perf/reaim.elm3b67.png
Something very bad has allegedly been happening in -mm. It would have been nice to have heard about this problem in that multi-month wwindow there. Does no human look at these numbers?
> Drilling down (there's not enough detail on the graphs for releases that > far back), I see it's actually between -git5 and -git6 > > These are both ia-32 NUMA machines, one is an x440, the other is NUMA-Q.
The 2.6.15-git5 -> 2.6.15-git6 diff is enormous. I'd assume some bad thing got transferred into mainline then.
How does one reproduce this? Which type of filesystem, which command line/config file?
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