Messages in this thread | | | From | Andy Lutomirski <> | Date | Thu, 6 Nov 2014 22:26:23 -0800 | Subject | Re: [LKP] [x86_64,entry] f04e05b81e4: -62.7% time.user_time |
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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?
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