From: Ben Hutchings <bhutchings@solarflare.com>
To: "Άλκης Γεωργόπουλος" <alkisg@gmail.com>
Cc: netdev@vger.kernel.org
Subject: Re: r8169 - disable flow-control?
Date: Thu, 05 Mar 2009 21:08:48 +0000 [thread overview]
Message-ID: <1236287329.3202.7.camel@achroite> (raw)
In-Reply-To: <1236281743.10409.17.camel@alkisg>
On Thu, 2009-03-05 at 21:35 +0200, Άλκης Γεωργόπουλος wrote:
> 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?
Generally you should be able to control this using ethtool, not a module
parameter. However r8169 does not implement this operation yet.
Ben.
--
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.
next prev parent reply other threads:[~2009-03-05 21:08 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-05 19:35 r8169 - disable flow-control? Άλκης Γεωργόπουλος
2009-03-05 21:08 ` Ben Hutchings [this message]
2009-03-05 21:29 ` Άλκης Γεωργόπουλος
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