netdev - Re: sky2 poweroff screws up my network

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Message-ID: <20100519081440.2883e71d@nehalam>
Date:	Wed, 19 May 2010 08:14:40 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Kyle McMartin <kmcmartin@...hat.com>
Cc:	netdev@...r.kernel.org
Subject: Re: sky2 poweroff screws up my network

On Wed, 19 May 2010 10:32:08 -0400
Kyle McMartin <kmcmartin@...hat.com> wrote:

> Hi Stephen,
> 
> I've noticed a rather strange problem with the onboard sky2 on one of my
> machines. When I halt -p it, my router stops passing traffic completely
> until I kill the power to the machine entirely. If it's just been shut
> down with halt -p, it recovers immediately after turning it back on,
> while it's in BIOS.
> 
> Any thoughts on this? My guess is its because the sky2 shutdown puts the
> nic to sleep and when the host is off, bad things happen.
> 
> regards, Kyle

The sky2 shutdown puts the chip in Wake On Lan state; this
does a separate link speed negotiation (100 mbit) which may be a problem
if speed duplex is forced.
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