Hi Fengguang,
On Fri, Jan 17, 2014 at 6:20 PM, Fengguang Wu <fengguang...@intel.com> wrote:
> Ming Lei,
>
> We noticed that commit 74e72f894 ("lib/percpu_counter.c: fix
> __percpu_counter_add()") introduces -47.6% regression in aim7 brk_test
> on a 2S SNB server. Comparing to its parent commit:
The commit has a bug, could you apply Hugh's patch[1] to test if
the regression can be fixed?
If the performance regression is still there, it may be caused by bad
performance of this_cpu_add(), then I suggest you to test the patch[2]
too without enabling lockdep.
[1], http://marc.info/?t=138991497900001&r=1&w=2
[2], http://marc.info/?l=linux-kernel&m=138909074202090&w=2
Thanks,
--
Ming Lei
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