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From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: "Leisner, Martin" <Martin.Leisner@xerox.com>
Cc: linux-pm@lists.linux-foundation.org, martyleisner@yahoo.com,
	NetDEV list <netdev@vger.kernel.org>
Subject: Re: [linux-pm] power draw depending on PHY speed
Date: Fri, 28 Aug 2009 21:03:59 +0200	[thread overview]
Message-ID: <200908282103.59159.rjw@sisk.pl> (raw)
In-Reply-To: <76FA3B279DD9DA48896E2B40494495720368E449@USA7061MS02.na.xerox.net>

On Friday 28 August 2009, Leisner, Martin wrote:
> While doing some current probe measurements (i.e. to measure the effects
> of NAP and frequency scaling with a freescale processor) I noticed some
> very
> significant differents if we ran on 100Mbit of 1000Mbit ethernet.
> 
> The hardware guys like at their data sheets and agreed.
> 
> Does anyone "drop ethernet speed" to save power?
> (when a system is idle, is isn't necessary to run 1G ethernet).

I don't know, really.  This is a netdev question IMO (CC added).

> When a system has WOL capability, what speed does it run at when the
> system is sleeping?

That's a very good question.  I bet that depends on the NIC in question, at
least I'm not sure if any spec regulates it.

Thanks,
Rafael

  reply	other threads:[~2009-08-28 19:03 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-08-28 15:26 power draw depending on PHY speed Leisner, Martin
2009-08-28 19:03 ` Rafael J. Wysocki [this message]
2009-08-28 19:29   ` Ben Hutchings
2009-08-28 19:29   ` [linux-pm] " Ben Hutchings
2009-08-28 19:03 ` Rafael J. Wysocki
2009-09-01 13:25 ` Pavel Machek

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