From mboxrd@z Thu Jan 1 00:00:00 1970 From: "H. Peter Anvin" Subject: Re: [RFC] sleepy linux Date: Wed, 26 Dec 2007 12:43:56 -0800 Message-ID: <4772BD0C.3040609@zytor.com> References: <20071225230731.GA29030@elf.ucw.cz> <4772A3FB.8080108@zytor.com> <200712262108.35643.oliver@neukum.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <200712262108.35643.oliver@neukum.org> Sender: linux-kernel-owner@vger.kernel.org To: Oliver Neukum Cc: Pavel Machek , kernel list , Linux-pm mailing list , "Rafael J. Wysocki" List-Id: linux-pm@vger.kernel.org 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