lkml.org 
[lkml]   [2014]   [Nov]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [LKP] [x86_64,entry] f04e05b81e4: -62.7% time.user_time
On Thu, Nov 6, 2014 at 10:00 PM, LKP <lkp@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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2014-11-07 08:01    [W:1.256 / U:0.400 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site