Hello Jack,
I'm seeing an issue on 82599 controllers. When hardware RSC is used, large
VLAN packets arrive without the VP bit set, even though the vtag in the
descriptor is correct. It totally kills the receive performance. Turning off
hardware RSC in the driver (falling back to software LRO) works fine, as does
turning off LRO entirely.
I've worked around the problem for now by overriding the VP bit if
ixgbe_rxeof() finds a valid vtag in the descriptor.
Have you seen this before?
It's not in the latest errata. It almost seems to be the opposite of what Ryan
reported in November 2010 ("82599 receiving packets with vlan tag=0 (vlan strip
problem)?").
Thanks,
Andrew
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Andrew Boyer abo...@averesystems.com
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