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

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Date:	Wed, 25 Sep 2013 18:21:29 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	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, 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 Wed, 25 Sep 2013 18:15:21 -0700 Arjan van de Ven <arjan@...ux.intel.com> wrote:

> On 9/25/2013 4:47 PM, Andi Kleen wrote:
> >> 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.
> >
> > On Sandy Bridge the memry wakeup overhead is really small. It's on by default
> > in most setups today.
> 
> btw note that those kind of memory power savings are content-preserving,
> so likely a whole chunk of these patches is not actually needed on SNB
> (or anything else Intel sells or sold)

(head spinning a bit).  Could you please expand on this rather a lot?

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