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Message-ID: <563A2BE2.4090101@linux.intel.com> Date: Wed, 4 Nov 2015 08:01:38 -0800 From: Arjan van de Ven <arjan@...ux.intel.com> To: riel@...hat.com, linux-pm@...r.kernel.org Cc: linux-kernel@...r.kernel.org, rafael.j.wysocki@...el.com, len.brown@...el.com, daniel.lezcano@...aro.org Subject: Re: [PATCH 2/3] cpuidle,menu: use interactivity_req to disable polling On 11/3/2015 2:34 PM, riel@...hat.com wrote: > From: Rik van Riel <riel@...hat.com> > > The menu governor carefully figures out how much time we typically > sleep for an estimated sleep interval, or whether there is a repeating > pattern going on, and corrects that estimate for the CPU load. > > Then it proceeds to ignore that information when determining whether > or not to consider polling. This is not a big deal on most x86 CPUs, > which have very low C1 latencies, and the patch should not have any > effect on those CPUs. > > However, certain CPUs (eg. Atom) have much higher C1 latencies, and > it would be good to not waste performance and power on those CPUs if > we are expecting a very low wakeup latency. > > Disable polling based on the estimated interactivity requirement, not > on the time to the next timer interrupt. > good catch! Acked-by: Arjan van de Ven <arjan@...ux.intel.com> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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