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

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Message-Id: <20130925164057.6bbaf23bdc5057c42b2ab010@linux-foundation.org>
Date:	Wed, 25 Sep 2013 16:40:57 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
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
Subject: Re: [Results] [RFC PATCH v4 00/40] mm: Memory Power Management

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 ;)

Also, the changelogs don't appear to discuss one obvious downside: the
latency incurred in bringing a bank out of one of the low-power states
and back into full operation.  Please do discuss and quantify that to
the best of your knowledge.


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