Messages in this thread | | | Date | Tue, 31 May 2016 14:41:51 +0200 | From | Peter Zijlstra <> | Subject | Re: [LKP] [lkp] [sched/fair] 53d3bc773e: hackbench.throughput -32.9% regression |
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On Tue, May 31, 2016 at 04:34:36PM +0800, Huang, Ying wrote: > Hi, Ingo, > > Part of the regression has been recovered in v4.7-rc1 from -32.9% to > -9.8%. But there is still some regression. Is it possible for fully > restore it?
after much searching on how you guys run hackbench... I figured something like:
perf bench sched messaging -g 20 --thread -l 60000
on my IVB-EP (2*10*2) is similar to your IVT thing.
And running something like:
for i in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor ; do echo performance > $i ; done perf stat --null --repeat 10 -- perf bench sched messaging -g 20 --thread -l 60000 | grep "seconds time elapsed"
gets me:
v4.6:
36.786914089 seconds time elapsed ( +- 0.49% ) 37.054017355 seconds time elapsed ( +- 1.05% )
origin/master (v4.7-rc1-ish):
34.757435264 seconds time elapsed ( +- 3.34% ) 35.396252515 seconds time elapsed ( +- 3.38% )
Which doesn't show a regression between v4.6 and HEAD; in fact it shows an improvement.
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