Messages in this thread | | | Date | Thu, 22 May 2008 18:15:33 +0100 | From | Ben Hutchings <> | Subject | Re: NIU - Sun Neptune 10g - Transmit timed out reset (2.6.24) |
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Jesper Krogh wrote: > David Miller wrote: > >From: Matheos Worku <Matheos.Worku@Sun.COM> > >Date: Fri, 09 May 2008 15:36:17 -0700 > > > >>I have observed TX throughput degradation (and increased CPU > >>utilization) occurs with increased # of connections, when CPU count > 4 > >>CPUs. I don't think it is related to the driver (or HW). > > > >All transmits through a device are fully serialized currently, > >it's a known problem and something we plan to fix. > > I google'd up this one: > > http://vger.kernel.org/~davem/davem_tokyo08.pdf (slide 23+). > > Does this mean that I can expect every 10G card to have this limitation > under Linux? Or are some known to be better than others? > (I can probably justify paying for another 10G card if I can expect to > gain the last 400MB/s). [...]
Our controller and driver can reach line rate for a single TCP/IPv4 stream, depending on the host system. I don't think we're alone in that, though there are few published benchmarks that don't involve TOEs.
Ben.
-- Ben Hutchings, Senior Software Engineer, Solarflare Communications Not speaking for my employer; that's the marketing department's job.
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