netdev - r8169 - disable flow-control?

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Message-Id: <1236281743.10409.17.camel@alkisg>
Date:	Thu, 05 Mar 2009 21:35:43 +0200
From:	Άλκης Γεωργόπουλος <alkisg@...il.com>
To:	netdev@...r.kernel.org
Subject: r8169 - disable flow-control?

Hello,

Is there any way to disable flow control for NICs using the r8169
driver?

It would be really valuable in the following (sadly very common)
scenario:
 * r8169 gigabit NIC on the server
 * unmanaged gigabit switch that supports flow control negotiation
 * 100Mbps clients

E.g. in LTSP labs, the server can send data at ~900Mbps with flow
control off, but with flow control on the bandwidth drops to ~90Mbps.
Detailed explanation of the problem:
http://virtualthreads.blogspot.com/2006/02/beware-ethernet-flow-control.html

If the current code doesn't support it, would it be possible to add a
module parameter for this?

Kind regards,
Alkis Georgopoulos

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