linux-kernel - Re: [RFC PATCH 2/3] sched: power aware load balance,

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Message-Id: <20121106115105.4ba6ab32.akpm@linux-foundation.org>
Date:	Tue, 6 Nov 2012 11:51:05 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Alex Shi <alex.shi@...el.com>
Cc:	rob@...dley.net, mingo@...hat.com, peterz@...radead.org,
	suresh.b.siddha@...el.com, arjan@...ux.intel.com,
	vincent.guittot@...aro.org, tglx@...utronix.de,
	gregkh@...uxfoundation.org, andre.przywara@....com, rjw@...k.pl,
	paul.gortmaker@...driver.com, paulmck@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org, cl@...ux.com, pjt@...gle.com
Subject: Re: [RFC PATCH 2/3] sched: power aware load balance,

On Tue,  6 Nov 2012 21:09:58 +0800
Alex Shi <alex.shi@...el.com> wrote:

> $for ((i=0; i < I; i++)) ; do while true; do : ; done & done
> 
> Checking the power consuming with a powermeter on the NHM EP.
> 	powersaving     performance
> I = 2   148w            160w
> I = 4   175w            181w
> I = 8   207w            224w
> I = 16  324w            324w
> 
> On a SNB laptop(4 cores *HT)
> 	powersaving     performance
> I = 2   28w             35w
> I = 4   38w             52w
> I = 6   44w             54w
> I = 8   56w             56w
> 
> On the SNB EP machine, when I = 16, power saved more than 100 Watts.

Confused.  According to the above table, at I=16 the EP machine saved 0
watts.  Typo in the data?


Also, that's a pretty narrow test - it's doing fork and exec at very
high frequency and things such as task placement decisions at process
startup might be affecting the results.  Also, the load will be quite
kernel-intensive, as opposed to the more typical userspace-intensive
loads.

So, please run a broader set of tests so we can see the effects?
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