linux-kernel - gigabit ethernet power consumption

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Message-ID: <20071008220720.GF3484@elf.ucw.cz>
Date:	Tue, 9 Oct 2007 00:07:20 +0200
From:	Pavel Machek <pavel@....cz>
To:	Arjan van de Ven <arjan@...radead.org>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: gigabit ethernet power consumption

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
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