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

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Message-ID: <20130925234734.GK18242@two.firstfloor.org>
Date:	Thu, 26 Sep 2013 01:47:34 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"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,
	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

> 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.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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