Comment 3 for bug 1602755

I tested this (both IPv4 over Geneve and IPv6 over sit) as well as looked at the proposed patch and everything looks good to me.

With a very simple setup (this does not go up to VMs so the full performance difference is not there), I see correct packet aggregation and improved performance:

Before:

root@server89:~# netperf -H 30.0.0.1
MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 30.0.0.1 () port 0 AF_INET : demo
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec

 87380 16384 16384 10.01 5538.36

After:

root@server89:~# netperf -H 30.0.0.1
MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 30.0.0.1 () port 0 AF_INET : demo
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec

 87380 16384 16384 10.00 7291.98