Eli Cohen wrote:
For the benefit of all - the issue was resolved by loading the mtnic module
with lro=0. It should be a general guidance to disable LRO for hosts that are
configured to route packets. The reason for this is that LRO aggregates IP
packets related to the same TCP stream to a single IP packet comprised of a
list SKBs, and by doing that, it does not recalculate the TCP checksum. Since
routing is done at the IP layer, the checksum on outgoing packets is not
recalculated and the
final destination will receive packets with bas TCP checksum.
So with the recent patch to ipoib which adds LRO, should we make the
default being LRO off? or maybe the approach brought by this patch "net:
Disable LRO on devices that are forwarding"
http://marc.info/?l=linux-netdev&m=121389887214425&w=2 would solve the
problem without the user intervention?
Or.
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