Subject: Re: Network drivers that don't suspend on interface down
From: Arjan van de Ven <arjan@infradead.org>
To: Olivier Galibert <galibert@pobox.com>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>, linux-kernel@vger.kernel.org,
       netdev@vger.kernel.org
In-Reply-To: <20061220164054.GA27938@dspnet.fr.eu.org>
References: <200612191959.43019.david-b@pacbell.net>
	 <20061220042648.GA19814@srcf.ucam.org>
	 <200612192114.49920.david-b@pacbell.net> <20061220053417.GA29877@suse.de>
	 <20061220055209.GA20483@srcf.ucam.org>
	 <1166601025.3365.1345.camel@laptopd505.fenrus.org>
	 <20061220125314.GA24188@srcf.ucam.org>
	 <1166621931.3365.1384.camel@laptopd505.fenrus.org>
	 <20061220152701.GA22928@dspnet.fr.eu.org>
	 <1166628858.3365.1425.camel@laptopd505.fenrus.org>
	 <20061220164054.GA27938@dspnet.fr.eu.org>
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Organization: Intel International BV
Date: Wed, 20 Dec 2006 18:21:39 +0100
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On Wed, 2006-12-20 at 17:40 +0100, Olivier Galibert wrote:
> On Wed, Dec 20, 2006 at 04:34:17PM +0100, Arjan van de Ven wrote:
> > 5 seconds is unfair and unrealistic though. The *hardware* negotiation
> > before link is seen can easily take upto 45 seconds already.
> > That's a network topology/hardware issue (spanning tree fun) that
> > software or even the hardware in your PC can do nothing about.
> 
> It's about ergonomics, not technical capabilities or fairness.
not entirely.

> 
> 
> > this means that the "power up time" needs to be at least 45 seconds, if
> > it's then down 5 seconds inbetween... that's not real power savings.
> 
> Then that means you can't have usable autodetection and power savings
> at the same time. 

even if you have NO power savings you still don't meet your criteria.
That's basic ethernet for you....

That's what I was trying to say; your criteria is unrealistic regardless
of what the kernel does, ethernet already dictates 30 to 45 seconds
there.


-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org

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