Hi Auke,
Based on the discussion in this thread, I am inclined to believe that
lack of PCI-e bus bandwidth is NOT the issue. The theory is that the
extra packet handling associated with TCP acknowledgements are pushing
the PCI-e x1 bus past its limits. However the evidence seems to show
otherwise:
(1) Bill Fink has reported the same problem on a NIC with a 133 MHz
64-bit PCI connection. That connection can transfer data at 8Gb/s.
That was even a PCI-X connection, which is known to have extremely good latency
numbers, IIRC better than PCI-e? (?) which could account for a lot of the
latency-induced lower performance...
also, 82573's are _not_ a serverpart and were not designed for this
usage. 82546's are and that really does make a difference.
I'm confused. It DOESN'T make a difference! Using 'server grade' 82546's
on a PCI-X bus, Bill Fink reports the SAME loss of throughput with TCP
full duplex that we see on a 'consumer grade' 82573 attached to a PCI-e x1
bus.
Just like us, when Bill goes from TCP to UDP, he gets wire speed back.
Cheers,
Bruce
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