On 06/28/2015 10:20 AM, Ramu Ramamurthy wrote:
Rick, in your test, are you seeing gro becoming effective on the
vxlan interface with the 82599ES nic ? (ie, tcpdump on the vxlan
interface shows larger frames than the mtu of that interface, and
kernel trace shows vxlan_gro_receive() being hit)
Throughputs of 5.5 Gbps (or the improved 7Gbs) leads me to suspect
that gro is still not effective in your test on the vxlan interface
with the 82588ES nic - Because, when vxlan gro became effective with
the patch I suggested earlier, I could see throughput of ~8.5 Gbps on
that nic.
For the 5.X gbit/s test, where I am not getting GRO, I am seeing 1398
byte data packets when I trace vxlan0.
For the other direction, at 7ish Gbit/s I am seeing 64XXX byte packets
on vxlan0, with the occasional 25XXX byte packet. If I disable gro on
that receiving vxlan0 interface, the throughput is more like 4.X Gbit/s
happy benchmarking,
rick
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