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Message-ID: <4835A007.7020601@krogh.cc> Date: Thu, 22 May 2008 18:32:07 +0200 From: Jesper Krogh <jesper@...gh.cc> To: David Miller <davem@...emloft.net> CC: Matheos.Worku@....COM, yhlu.kernel@...il.com, linux-kernel@...r.kernel.org, netdev@...r.kernel.org Subject: Re: NIU - Sun Neptune 10g - Transmit timed out reset (2.6.24) David Miller wrote: > From: Matheos Worku <Matheos.Worku@....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). Since I cannot push more than ~600MB/s through the NIC before a single cpu is bottlenecked, it seem most likely to be this TX throughput thing I hit. Thanks Jesper -- Jesper -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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