linux-kernel - Re: [RFCv2 PATCH 00/23] sched: Energy cost model for energy-aware scheduling

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Message-ID: <20140708002343.GC25653@intel.com>
Date:	Tue, 8 Jul 2014 08:23:43 +0800
From:	Yuyang Du <yuyang.du@...el.com>
To:	Morten Rasmussen <morten.rasmussen@....com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"vincent.guittot@...aro.org" <vincent.guittot@...aro.org>,
	"daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
	"preeti@...ux.vnet.ibm.com" <preeti@...ux.vnet.ibm.com>,
	Dietmar Eggemann <Dietmar.Eggemann@....com>,
	"pjt@...gle.com" <pjt@...gle.com>
Subject: Re: [RFCv2 PATCH 00/23] sched: Energy cost model for energy-aware
 scheduling

Hi Morten,

On Mon, Jul 07, 2014 at 03:16:27PM +0100, Morten Rasmussen wrote:

> Could you elaborate on what you mean by 'a general statement'?

The general statement is: higher freq, more cap, and more power. More specific
numbers are not needed, as they are just instances of this general statement.

> cpu_power doesn't tell you anything about energy-efficiency. There is no
> link with frequency scaling.

In general, more cpu_power, more freq, less energy-efficiency, as you said sometime ago.

> No representation of power domains.

Represented by CPU topology?

Thanks,
Yuyang
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