linux-kernel - Re: Attempted summary of suspend-blockers LKML thread, take three

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Message-ID: <20100816160911.GA3479@srcf.ucam.org>
Date:	Mon, 16 Aug 2010 17:09:11 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	paulmck@...ux.vnet.ibm.com, Pavel Machek <pavel@....cz>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Felipe Contreras <felipe.contreras@...il.com>,
	Ted Ts'o <tytso@....edu>, david@...g.hm,
	Brian Swetland <swetland@...gle.com>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	arve@...roid.com, florian@...kler.org, rjw@...k.pl,
	stern@...land.harvard.edu, peterz@...radead.org,
	tglx@...utronix.de, menage@...gle.com, david-b@...bell.net,
	James.Bottomley@...e.de, swmike@....pp.se, galibert@...ox.com,
	dipankar@...ibm.com
Subject: Re: Attempted summary of suspend-blockers LKML thread, take three

On Sat, Aug 14, 2010 at 09:53:51AM -0700, Arjan van de Ven wrote:

> they tend to go "off".
> 
> however I think you're making an assumption that there is a
> real difference between a deep idle state and "off"....
> 
> For modern x86 hardware, that assumption isn't really valid.
> (other than a very very small sram that stores register content in the
> idle case)

Really? I thought the TSC stopped in suspend. Does having a package go 
into C6 mean that the RAM goes into self-refresh?

-- 
Matthew Garrett | mjg59@...f.ucam.org
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