linux-kernel - Re: [RFC] sleepy linux

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Message-ID: <4772BF86.4010906@zytor.com>
Date:	Wed, 26 Dec 2007 12:54:30 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Pavel Machek <pavel@....cz>
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

Pavel Machek wrote:
> 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

Still... if we could get the desktops of the world down anywhere close 
to that range when not used, it would be a huge win.

	-hpa
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