linux-kernel - Re: [Results] [RFC PATCH v4 00/40] mm: Memory Power Management

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Message-ID: <52827839.80904@linux.vnet.ibm.com>
Date:	Wed, 13 Nov 2013 00:19:29 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	mgorman@...e.de, dave@...1.net, hannes@...xchg.org,
	tony.luck@...el.com, matthew.garrett@...ula.com, riel@...hat.com,
	arjan@...ux.intel.com, srinivas.pandruvada@...ux.intel.com,
	willy@...ux.intel.com, kamezawa.hiroyu@...fujitsu.com,
	lenb@...nel.org, rjw@...k.pl, gargankita@...il.com,
	paulmck@...ux.vnet.ibm.com, svaidy@...ux.vnet.ibm.com,
	andi@...stfloor.org, isimatu.yasuaki@...fujitsu.com,
	santosh.shilimkar@...com, kosaki.motohiro@...il.com,
	linux-pm@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, maxime.coquelin@...ricsson.com,
	loic.pallardy@...ricsson.com, amit.kachhap@...aro.org,
	thomas.abraham@...aro.org, markgross@...gnar.org
Subject: Re: [Results] [RFC PATCH v4 00/40] mm: Memory Power Management

On 11/12/2013 01:32 PM, Srivatsa S. Bhat wrote:
> On 09/26/2013 06:28 PM, Srivatsa S. Bhat wrote:
>> On 09/26/2013 05:10 AM, Andrew Morton wrote:
>>> On Thu, 26 Sep 2013 04:56:32 +0530 "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com> wrote:
>>>
>>>> Experimental Results:
>>>> ====================
>>>>
>>>> Test setup:
>>>> ----------
>>>>
>>>> x86 Sandybridge dual-socket quad core HT-enabled machine, with 128GB RAM.
>>>> Memory Region size = 512MB.
>>>
>>> Yes, but how much power was saved ;)
>>>
>>
>> I don't have those numbers yet, but I'll be able to get them going forward.
>>
> 
> Hi,
> 
> I performed experiments on an IBM POWER 7 machine and got actual power-savings
> numbers (upto 2.6% of total system power) from this patchset. I presented them
> at the Kernel Summit but forgot to post them on LKML. So here they are:
> 

<snip>

And here is a recent LWN article that highlights the important design changes
in this version and gives a good overview of this patchset as a whole:

http://lwn.net/Articles/568891/

And here is the link to the patchset (v4):
http://lwn.net/Articles/568369/

Regards,
Srivatsa S. Bhat
 

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