On (03/30/16 12:41), Jesse Brandeburg wrote: > This gets "Even Uglier", I've turned off all offloads at my receiver, > enabled calling skb_linearize on *all* frames, which works fine for > scp, but the receiver shows > MSS sized frames on the wire for > rds-stress traffic.
fwiw, I was not able to reproduce this tx issue with iperf/netperf etc either (I tried various perumtations of bidir, req-resp etc). One difference between the rds-stress invocation and the other callers is that this comes down via tcp_sendpage(), I dont know if there is something in the sendpage path that i40e does not anticipate. Other drivers (ixgbe etc) work fine, so my hunch would be that this is specific to i40e (and not a skb_linearize bug) but I could be wrong. --Sowmini
