Re: NIU - Sun Neptune 10g - Transmit timed out reset (2.6.24)
From: Jesper Krogh
Date: Thu May 22 2008 - 12:32:37 EST
David Miller wrote:
From: Matheos Worku <Matheos.Worku@xxxxxxx>
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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