Messages in this thread | | | From | Andy Lutomirski <> | Date | Wed, 21 May 2014 15:46:58 -0700 | Subject | Re: [x86, vdso] cfda7bb9ecb: +14.7% will-it-scale.per_thread_ops |
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On Mon, May 19, 2014 at 10:59 PM, Jet Chen <jet.chen@intel.com> wrote: > Hi Andy, > > FYI, we noticed the below changes on > > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/vdso > commit cfda7bb9ecbf9d96264bb5bade33a842966d1062 ("x86, vdso: Move syscall > and sysenter setup into kernel/cpu/common.c")
This is really strange. That change shouldn't have any effect except that some kernels might boot a cycle or two faster.
> > test case: nhm4/will-it-scale/sched_yield > > 3d7ee969bffcc98 cfda7bb9ecbf9d96264bb5bad > --------------- ------------------------- > 5497021 ~ 0% +14.7% 6303424 ~ 0% TOTAL > will-it-scale.per_thread_ops > 0.54 ~ 0% +5.6% 0.57 ~ 0% TOTAL will-it-scale.scalability > 6209483 ~ 0% +1.6% 6305917 ~ 0% TOTAL > will-it-scale.per_process_ops > 2455 ~ 5% +16.9% 2870 ~ 5% TOTAL cpuidle.C1-NHM.usage > 8829 ~ 7% +15.2% 10169 ~10% TOTAL > slabinfo.kmalloc-64.active_objs > 24.13 ~12% +48.9% 35.93 ~14% TOTAL time.user_time > 393 ~ 0% -3.0% 382 ~ 1% TOTAL time.system_time >
Is this a speedup or a slowdown?
--Andy
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