linux-kernel - Re: gigabit ethernet power consumption

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Date:	Fri, 12 Oct 2007 16:30:16 -0400
From:	Valdis.Kletnieks@...edu
To:	"Kok, Auke" <auke-jan.h.kok@...el.com>
Cc:	7eggert@....de, Kok@...p.glb.intel.com, prasad@...ux.vnet.ibm.com,
	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>,
	Pavel Machek <pavel@....cz>,
	Arjan van de Ven <arjan@...radead.org>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: gigabit ethernet power consumption

On Fri, 12 Oct 2007 09:35:15 PDT, "Kok, Auke" said:

> > How much power does a non-connected NIC consume, and can you save power
> > by forcing 10 MBit until a link is detected (doubling negotiation time)?
> 
> no, the PHY consumes a minimal amount of energy when not connected, regardless of
> whether it is advertising 10, 100 or 1000mbit.

Is that true for essentially all the chipsets we support (or at least "the vast
majority of the ones currently found in common machines")?

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