Messages in this thread | | | Date | Wed, 28 Jul 2010 16:50:40 -0700 | Subject | Re: [patch] Remove the per cpu tick skew | From | john stultz <> |
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On Wed, Jul 28, 2010 at 1:26 PM, john stultz <johnstul@us.ibm.com> wrote: > On Tue, Jul 27, 2010 at 9:02 PM, Arjan van de Ven <arjan@infradead.org> wrote: >> Historically, Linux has tried to make the regular timer tick on the various >> CPUs not happen at the same time, to avoid contention on xtime_lock. >> >> Nowadays, with the tickless kernel, this contention no longer happens >> since time keeping and updating are done differently. In addition, >> this skew is actually hurting power consumption in a measurable >> way on many-core systems. >> > > I'll give it a spin against -rt and see if we show any latency jumps.
In my testing on a 8way box, I didn't see any concerning latencies with this patch running cyclictest or a FIFO99 gtod loop.
thanks -john
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