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

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Date:	Thu, 26 Sep 2013 08:29:39 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>, mgorman@...e.de,
	dave@...1.net, hannes@...xchg.org, tony.luck@...el.com,
	matthew.garrett@...ula.com, riel@...hat.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
Subject: Re: [Results] [RFC PATCH v4 00/40] mm: Memory Power Management

On 9/26/2013 5:58 AM, Srivatsa S. Bhat wrote:
> Let me explain the challenge I am facing. A prototype powerpc platform that
> I work with has the capability to transition memory banks to content-preserving
> low-power states at a per-socket granularity. What that means is that we can
> get memory power savings*without*  needing to go to full-system-idle, unlike
> Intel platforms such as Sandybridge.

btw this is not a correct statement
even Sandybridge can put memory in low power states (just not self refresh) even if the system is not idle
(depending on bios settings to enable this)

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