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SubjectRe: [PATCH 3/5] perf core: Prepare writing into ring buffer from end
On Fri, Mar 25, 2016 at 10:14:36PM +0800, Wangnan (F) wrote:
> >>I think you enabled some unusual config options?

x86_64-defconfig

> >You must enabled CONFIG_OPTIMIZE_INLINING. Now I get similar result:

It has that indeed.

> After enabling CONFIG_OPTIMIZE_INLINING:
>
> Test its performance by calling 'close(-1)' for 3000000 times and
> use 'perf record -o /dev/null -e raw_syscalls:* test-ring-buffer' to
> capture system calls:
>
> MEAN STDVAR
> BASE 800077.1 23448.13
> RAWPERF.PRE 2465858.0 603473.70
> RAWPERF.POST 2471925.0 609437.60
>
> Considering the high stdvar, after applying this patch the performance
> is not change.

Why is your variance so immense? And doesn't that render the
measurements pointless?

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