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SubjectRe: [PATCH 0/4] Fix ebizzy performance regression due to X86 TLB range flush v2
On Sun, Dec 15, 2013 at 03:55:39PM +0000, Mel Gorman wrote:
> <SNIP>
> tlbflush micro benchmark
> 3.13.0-rc3 3.13.0-rc3 3.4.69
> vanilla nowalk-v2r7 vanilla
> Min 1 7.00 ( 0.00%) 6.00 ( 14.29%) 5.00 ( 28.57%)
> Min 2 8.00 ( 0.00%) 6.00 ( 25.00%) 4.00 ( 50.00%)
> Min 3 13.00 ( 0.00%) 11.00 ( 15.38%) 9.00 ( 30.77%)
> Min 4 17.00 ( 0.00%) 19.00 (-11.76%) 15.00 ( 11.76%)
> Mean 1 11.28 ( 0.00%) 10.66 ( 5.48%) 5.17 ( 54.13%)
> Mean 2 11.42 ( 0.00%) 11.52 ( -0.85%) 9.04 ( 20.82%)
> Mean 3 23.43 ( 0.00%) 21.64 ( 7.64%) 10.92 ( 53.39%)
> Mean 4 35.33 ( 0.00%) 34.17 ( 3.28%) 19.55 ( 44.67%)
> Range 1 6.00 ( 0.00%) 7.00 (-16.67%) 4.00 ( 33.33%)
> Range 2 23.00 ( 0.00%) 36.00 (-56.52%) 19.00 ( 17.39%)
> Range 3 15.00 ( 0.00%) 17.00 (-13.33%) 10.00 ( 33.33%)
> Range 4 29.00 ( 0.00%) 26.00 ( 10.34%) 9.00 ( 68.97%)
> Stddev 1 1.01 ( 0.00%) 1.12 ( 10.53%) 0.57 (-43.70%)
> Stddev 2 1.83 ( 0.00%) 3.03 ( 66.06%) 6.83 (274.00%)
> Stddev 3 2.82 ( 0.00%) 3.28 ( 16.44%) 1.21 (-57.14%)
> Stddev 4 6.65 ( 0.00%) 6.32 ( -5.00%) 1.58 (-76.24%)
> Max 1 13.00 ( 0.00%) 13.00 ( 0.00%) 9.00 ( 30.77%)
> Max 2 31.00 ( 0.00%) 42.00 (-35.48%) 23.00 ( 25.81%)
> Max 3 28.00 ( 0.00%) 28.00 ( 0.00%) 19.00 ( 32.14%)
> Max 4 46.00 ( 0.00%) 45.00 ( 2.17%) 24.00 ( 47.83%)
>
> <SNIP>
>
> 3.13.0-rc3 3.13.0-rc3 3.4.69
> vanilla nowalk-v2r7 vanilla
> User 179.36 165.25 97.29
> System 153.59 155.07 128.32
> Elapsed 1439.52 1437.69 2802.01
>

After I ran the test, I looked closer at the elapsed times and it was
due to a bug in the test setup itself. The tlbflush tests will need to
be rerun but ebizzy still has the problem where threads see very
different performance.

--
Mel Gorman
SUSE Labs


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