linux-kernel - Re: [PATCH v7 0/8] Tunable sched_mc_power

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Message-ID: <20081230024819.GA23301@balbir.in.ibm.com>
Date:	Tue, 30 Dec 2008 08:18:19 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	MinChan Kim <minchan.kim@...il.com>
Cc:	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	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>,
	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>,
	Pavel Machek <pavel@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v7 0/8] Tunable sched_mc_power_savings=n

* MinChan Kim <minchan.kim@...il.com> [2008-12-30 08:43:58]:

> Hi, Vaidyanathan.
> It's very late reponse. :(
> 
> > 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       81.68        52.83% 54.71%  1.00x J 1.00y W
> > 1       80.70        36.62% 70.11%  0.95x J 0.96y W
> > 2       74.95        19.53% 85.92%  0.90x J 0.98y W
> >
> > The results are marginally better than the previous version of the
> > patch series which could be within the test variation.
> >
> > Please feel free to test, and let me know your comments and feedback.
> > I will post more experimental results with various benchmarks.
> 
> Your result is very interesting.
> level 2 is more fast and efficient of power.
> 
> What's major contributor to use less time in level 2?
> I think it's cache bounce is less time than old.
> Is right ?
>

Yes, correct
 
> I want to test SCHED_MC but I don't know what you use to benchmark about power.
> How do I get the data about 'Package, Idle, Energy, Power'?
> 

Note, it is Package Idle (for both packages), it is a x86-64 8 core,
dual socket, quad core box. It is not Package, Idle.

For Energy and Power you need a means of measuring power like a meter.

> -- 
> Kinds regards,
> MinChan Kim
> 

-- 
	Balbir
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