[ovs-build] Broken: roidayan/ovs#294 (for-upstream - 2109841)

[Travis CI]

Build Update for roidayan/ovs
-------------------------------------

Build: #294
Status: Broken

Duration: 38 mins and 20 secs
Commit: 2109841 (for-upstream)
Author: Yi Yang
Message: Use batch process recv for tap and raw socket in netdev datapath

Current netdev_linux_rxq_recv_tap and netdev_linux_rxq_recv_sock
just receive single packet, that is very inefficient, per my test
case which adds two tap ports or veth ports into OVS bridge
(datapath_type=netdev) and use iperf3 to do performance test
between two ports (they are set into different network name space).

The result is as below:

  tap:  295 Mbits/sec
  veth: 207 Mbits/sec

After I change netdev_linux_rxq_recv_tap and
netdev_linux_rxq_recv_sock to use batch process, the performance
is boosted by about 7 times, here is the result:

  tap:  1.96 Gbits/sec
  veth: 1.47 Gbits/sec

Undoubtedly this is a huge improvement although it can't match
OVS kernel datapath yet.

FYI: here is thr result for OVS kernel datapath:

  tap:  37.2 Gbits/sec
  veth: 36.3 Gbits/sec

Note: performance result is highly related with your test machine,
you shouldn't expect the same results on your test machine.

Signed-off-by: Yi Yang <yangyi01 at inspur.com>
Signed-off-by: Ben Pfaff <blp at ovn.org>

View the changeset: https://github.com/roidayan/ovs/compare/9ce4832cdb93...2109841b7984

View the full build log and details: https://travis-ci.org/roidayan/ovs/builds/636189555?utm_medium=notification&utm_source=email

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