linux-kernel - Re: [RFC PATCH v5 0/7] Tunable sched_mc_power

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Date:	Thu, 1 Jan 1970 01:13:43 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Suresh B Siddha <suresh.b.siddha@...el.com>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Vatsa <vatsa@...ux.vnet.ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>,
	Andi Kleen <andi@...stfloor.org>,
	David Collier-Brown <davecb@....com>,
	Tim Connors <tconnors@...ro.swin.edu.au>,
	Max Krasnyansky <maxk@...lcomm.com>,
	Gregory Haskins <gregory.haskins@...il.com>
Subject: Re: [RFC PATCH v5 0/7] Tunable sched_mc_power_savings=n


> Results:
> --------
> 
> Basic functionality of the code has not changed and the power vs
> performance benefits for kernbench are similar to the ones posted
> earlier.
> 
> KERNBENCH Runs: make -j4 on a x86 8 core, dual socket quad core cpu
> package system
> 
> SchedMC Run Time     Package Idle    Energy  Power
> 0	81.28	     52.43% 53.53%  1.00x J 1.00y W
> 1	80.71	     37.35% 68.91%  0.96x J 0.97y W
> 2	76.05	     23.81% 82.65%  0.92x J 0.98y W
> 
> *** This is RFC code and not for inclusion ***

Hmm, so it makes it compile faster _and_ it saves power? Why to keep
it tunable at all if it is win-win? Or are there other benchmarks?

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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