On Thu, Nov 6, 2014 at 10:00 PM, LKP <l...@01.org> wrote:
> FYI, we noticed the below changes on
>
> git://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git x86/entry
> commit f04e05b81e4d9ae88bee379f12176f551a24394a ("x86_64,entry: Use sysret to
> return to userspace when possible")
>
>
> f2ee9bebb99dd4a4 f04e05b81e4d9ae88bee379f12 testbox/testcase/testparams
> ---------------- --------------------------
> %stddev %change %stddev
> \ | \
> 24.09 ± 4% -62.7% 8.99 ± 3%
> lkp-wsx02/aim9/performance-300s-creat-clo
> 24.09 -62.7% 8.99 GEO-MEAN time.user_time
>
I don't really know how to interpret this. Is this a good thing or a bad thing?
I actually expect this change to be a dramatic speedup for some
workloads. Any chance you can send me the .config, kernel command
line, and whether you have any tracing features enabled?
--Andy
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