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    SubjectRe: NIU - Sun Neptune 10g - Transmit timed out reset (2.6.24)
    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).

    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


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