linux-kernel - Re: [RFC] sleepy linux

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Message-ID: <4772BD0C.3040609@zytor.com>
Date:	Wed, 26 Dec 2007 12:43:56 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Oliver Neukum <oliver@...kum.org>
CC:	Pavel Machek <pavel@....cz>,
	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

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.  Heck, I'm constantly frustrated by every distro upgrade breaking 
power management for my monitor.

	-hpa
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