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.
