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Date: Thu, 31 Jan 2013 16:40:39 +0900 From: Namhyung Kim <namhyung@...nel.org> To: Michael Wang <wangyun@...ux.vnet.ibm.com> Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>, linux-kernel@...r.kernel.org, "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>, tglx@...utronix.de Subject: Re: [RFC 2/2] sched/fair: prefer a CPU in the "lowest" idle state On Thu, 31 Jan 2013 15:30:02 +0800, Michael Wang wrote: > On 01/31/2013 02:58 PM, Namhyung Kim wrote: >> But AFAIK the number of states in cpuidle is usually less than 10 so maybe >> we can change the weight then, but there's no promise... > > And I just got another case we should take care: > > group 0 cpu 0 cpu 1 > power index 8 power index 8 > > > group 1 cpu 2 cpu 3 > power index 0 load 15 > > so load of group 0 is 16 and group 1 is 15, but group 0 is better... Maybe it's not. The cpus in group 0 are in a lower power state so that there will be a benefit to select cpu 2 from the power' PoV IMHO. Also such a low power state has a longer exit latency so that we should choose cpu2 to get a better performance and it's the basic idea of this patchset I believe. Thanks, Namhyung -- 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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