Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755833AbXJHWHt (ORCPT ); Mon, 8 Oct 2007 18:07:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754217AbXJHWHf (ORCPT ); Mon, 8 Oct 2007 18:07:35 -0400 Received: from atrey.karlin.mff.cuni.cz ([195.113.31.123]:39624 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754145AbXJHWHe (ORCPT ); Mon, 8 Oct 2007 18:07:34 -0400 Date: Tue, 9 Oct 2007 00:07:20 +0200 From: Pavel Machek To: Arjan van de Ven , kernel list Subject: gigabit ethernet power consumption Message-ID: <20071008220720.GF3484@elf.ucw.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Warning: Reading this can be dangerous to your mental health. User-Agent: Mutt/1.5.16 (2007-06-11) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 883 Lines: 22 Hi! I've found that gbit vs. 100mbit power consumption difference is about 1W -- pretty significant. (Maybe powertop should include it in the tips section? :). Energy Star people insist that machines should switch down to 100mbit when network is idle, and I guess that makes a lot of sense -- you save 1W locally and 1W on the router. Question is, how to implement it correctly? Daemon that would watch data rates and switch speeds using mii-tool would be simple, but is that enough? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/