linux-kernel - Re: [RFC PATCHC 0/3] sched/idle : find the idlest cpu with cpuidle info

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Message-ID: <20140415131311.GM11182@twins.programming.kicks-ass.net>
Date:	Tue, 15 Apr 2014 15:13:11 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Alex Shi <alex.shi@...aro.org>,
	Morten Rasmussen <morten.rasmussen@....com>
Subject: Re: [RFC PATCHC 0/3] sched/idle : find the idlest cpu with cpuidle
 info

On Tue, Apr 01, 2014 at 11:05:16AM +0200, Vincent Guittot wrote:
> >> We are working on a bench which can generate middle load pattern with
> >> idle CPUs but it's not available yet. In the mean time, one bench that
> >> plays with idle time is cyclictest, it will not give you performance
> >> results but only scheduling latency which might be what you are
> >> looking for.
> >
> >
> > Yeah, thanks. I believe I know what is in the rt-tests package :)
> >
> > What I meant is what kind of values would you like to see with this patchset
> > ?
> 
> IIUC, you patch tries to improve the wake up latency of a task by
> selecting the CPUs with the shallowest C-state, so this metrics seems
> to be a good candidate

cyclic-test might be too regular to really measure anything though.
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