linux-kernel - Re: [RFC] sleepy linux

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Message-ID: <20071226205103.GG8094@elf.ucw.cz>
Date:	Wed, 26 Dec 2007 21:51:03 +0100
From:	Pavel Machek <pavel@....cz>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Oliver Neukum <oliver@...kum.org>,
	kernel list <linux-kernel@...r.kernel.org>,
	Linux-pm mailing list <linux-pm@...ts.osdl.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [RFC] sleepy linux

On Wed 2007-12-26 12:43:56, H. Peter Anvin wrote:
> Oliver Neukum wrote:
>> Am Mittwoch, 26. Dezember 2007 19:56:59 schrieb H. Peter Anvin:
>>>> 3) Network card that is either down
>>>>    or can wake up system on any packet (and not loose too many packets)
>>>>
>>> This is the big crux I see.  You're going to constantly wake up the 
>>> machine due to broadcast packets, and spend a lot of power just going in 
>>> and out of S3.
>> How many machines care a lot about saving power while they are connected
>> to an ethernet? Wlan might be more of a problem.
>
> A lot of them should.  An inordinate amount of machines sit there burning 
> power for no reason.  You can argue that S3 isn't needed -- that nohz + 
> C3/C4 + turning off the screen would be enough, and that might be
> + legit.  

NOHZ + C4 + turn off screen + turn off disk + turn off SATA is still
~8W on thinkpad x60.

S3 is ~1W.

That's quite significant difference.

(But yes, connected-to-ethernet is not most important use scenario.)
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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