Hi David,
Thanks for your note.
(The performance of a full duplex stream should be close to 1Gb/s in
both directions.)
This is not a reasonable expectation.
ACKs take up space on the link in the opposite direction of the
transfer.
So the link usage in the opposite direction of the transfer is
very far from zero.
Indeed, we are not asking to see 1000 Mb/s. We'd be happy to see 900
Mb/s.
Netperf is trasmitting a large buffer in MTU-sized packets (min 1500
bytes). Since the acks are only about 60 bytes in size, they should be
around 4% of the total traffic. Hence we would not expect to see more
than 960 Mb/s.
We have run these same tests on older kernels (with Broadcomm NICS) and
gotten above 900 Mb/s full duplex.
Cheers,
Bruce
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