On Wed, Jul 28, 2010 at 1:26 PM, john stultz <johnstul@xxxxxxxxxx> wrote: > On Tue, Jul 27, 2010 at 9:02 PM, Arjan van de Ven <arjan@xxxxxxxxxxxxx> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
