On Wed, 2016-03-30 at 16:09 -0400, Sowmini Varadhan wrote: > 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.
You might try netperf -t TCP_SENDFILE -- -m 150 to let netperf use sendfile() on small frags.
