netdev - Re: [patch 02/10] forcedeth: power down phy when interface is down

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Message-ID: <e6c711510712131653p3c871115r6e9cf33e0c984772@mail.gmail.com>
Date:	Thu, 13 Dec 2007 16:53:58 -0800
From:	"Ed Swierk" <eswierk@...stra.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	"Ayaz Abdulla" <AAbdulla@...dia.com>, jeff@...zik.org,
	netdev@...r.kernel.org
Subject: Re: [patch 02/10] forcedeth: power down phy when interface is down

On 12/13/07, Andrew Morton <akpm@...ux-foundation.org> wrote:
> Does this patch actually fix any observeable problem?

Without the patch, ifconfig down leaves the physical link up, which
confuses datacenter users who expect the link lights both on the NIC
and the switch to go out when they bring an interface down.

Furthermore, even though the phy is powered on, autonegotiation stops
working, so a normally gigabit link might suddenly become 100 Mbit
half-duplex when the interface goes down, and become gigabit when it
comes up again.

--Ed
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