linux-kernel - Re: [PATCH 3/4] sched: introduce synchronized idle injection

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Date:	Tue, 19 Jan 2016 13:06:05 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Ingo Molnar <mingo@...hat.com>,
	John Stultz <john.stultz@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Len Brown <len.brown@...el.com>,
	Rafael Wysocki <rafael.j.wysocki@...el.com>,
	Eduardo Valentin <edubezval@...il.com>,
	Paul Turner <pjt@...gle.com>
Subject: Re: [PATCH 3/4] sched: introduce synchronized idle injection


* Jacob Pan <jacob.jun.pan@...ux.intel.com> wrote:

> Note: PPW_RAPL= performance per watt measured by RAPL package power
> meter.
> 
> If we just look at 20% forced idle, I can see significantly more deep
> package C-states(PC7) residency.
> 		Pkg%pc2 	Pkg%pc6 	Pkg%pc7 
> w/o patch	3.17		4.39   		13.21 
> w/ patch	1.15   		1.43            17.24 

Can this be translated to: "this patch improved power efficiency (watts per 
second) by XYZ percent?", with XYZ filled in accordingly?

Thanks,

	Ingo