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Subject: Re: suspend2 merge (was Re: [Suspend2-devel] Re: CFS and suspend2:
	hang in atomic copy)
From: "Antonino A. Daplas" <adaplas@gmail.com>
To: Adrian Bunk <bunk@stusta.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
       Pavel Machek <pavel@ucw.cz>, Ingo Molnar <mingo@elte.hu>,
       Nigel Cunningham <nigel@nigel.suspend2.net>,
       Christian Hesse <mail@earthworm.de>, Nick Piggin <npiggin@suse.de>,
       Mike Galbraith <efault@gmx.de>, linux-kernel@vger.kernel.org,
       Con Kolivas <kernel@kolivas.org>, suspend2-devel@lists.suspend2.net,
       Andrew Morton <akpm@linux-foundation.org>,
       Thomas Gleixner <tglx@linutronix.de>,
       Arjan van de Ven <arjan@infradead.org>
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Date: Thu, 26 Apr 2007 09:25:02 +0800
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On Wed, 2007-04-25 at 21:25 +0200, Adrian Bunk wrote:
> On Wed, Apr 25, 2007 at 11:50:45AM -0700, Linus Torvalds wrote:
> > 
> > 
> > On Wed, 25 Apr 2007, Adrian Bunk wrote:
> > > 
> > > 3W for the complete system? In CPU state S1? [1]
> > 
> > In STR, 3W is quite realistic. The CPU is off, all (or most - up to you) 
> > the devices are off, but the motherboard and memory is powered.
> 
> As far as I understand it, the CPU isn't off in S1.
> 
> > > And even 3W would still be a waste of energy.

It is, especially if you're living in a place where power infrastructure
is unreliable (such as where I live). Currently, because of the summer
heat, power demand exceeds power supply so we experience practically
daily rotating 4-hour power interruption. 

That 3W saved multiplied by the total number of computers is a lot.
In this perspective, S2D (or shutdown) is preferred over S2RAM.

Tony