linux-kernel - Re: [RFC PATCH] Increase in idle power with schedutil

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Message-ID: <20160523092451.GF15728@worktop.ger.corp.intel.com>
Date:	Mon, 23 May 2016 11:24:51 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:	Steve Muckle <steve.muckle@...aro.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>,
	shreyas@...ux.vnet.ibm.com, akshay.adiga@...ux.vnet.ibm.com,
	linuxppc-dev@...abs.org
Subject: Re: [RFC PATCH] Increase in idle power with schedutil

On Mon, May 23, 2016 at 10:00:04AM +0100, Lorenzo Pieralisi wrote:
> It is also related to static leakage power that depends on the operating
> voltage (ie higher operating frequencies require higher voltage) so in a
> way scaling frequency before going idle may not be effective if voltage
> does not scale too in turn.

Sure, but the platform drivers 'know' all this and can make the right
decision.