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Message-Id: <1236287329.3202.7.camel@achroite> Date: Thu, 05 Mar 2009 21:08:48 +0000 From: Ben Hutchings <bhutchings@...arflare.com> To: Άλκης Γεωργόπουλος <alkisg@...il.com> Cc: netdev@...r.kernel.org Subject: Re: r8169 - disable flow-control? 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. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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