[ovs-build] Errored: ovsrobot/ovs#2080 (series_149964 - 7784ce7)

[Travis CI]

Build Update for ovsrobot/ovs
-------------------------------------

Build: #2080
Status: Errored

Duration: 49 mins and 35 secs
Commit: 7784ce7 (series_149964)
Author: Yifeng Sun
Message: afxdp: Reduce afxdp's batch size to match kernel's xdp batch size

William reported that there is iperf TCP issue between two afxdp ports:

[  3] local 10.1.1.2 port 40384 connected with 10.1.1.1 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 1.0 sec  17.0 MBytes   143 Mbits/sec
[  3]  1.0- 2.0 sec  9.62 MBytes  80.7 Mbits/sec
[  3]  2.0- 3.0 sec  6.75 MBytes  56.6 Mbits/sec
[  3]  3.0- 4.0 sec  11.0 MBytes  92.3 Mbits/sec
[  3]  5.0- 6.0 sec  0.00 Bytes  0.00 bits/sec
[  3]  6.0- 7.0 sec  0.00 Bytes  0.00 bits/sec
[  3]  7.0- 8.0 sec  0.00 Bytes  0.00 bits/sec
[  3]  8.0- 9.0 sec  0.00 Bytes  0.00 bits/sec
[  3]  9.0-10.0 sec  0.00 Bytes  0.00 bits/sec
[  3] 10.0-11.0 sec  0.00 Bytes  0.00 bits/sec

The reason is, currently, netdev-afxdp's batch size is 32 while kernel's
xdp batch size is only 16. This can result in exhausting of sock wmem if
netdev-afxdp keeps sending large number of packets. Later on, when ARP
expires at one side of TCP connection, ARP packets can be delayed or
even dropped because sock wmen is already full.

This patch fixes this issue by reducing netdev-afxdp's batch size so
as to match kernel's xdp batch size. Now iperf TCP works correctly.

[  3] local 10.1.1.2 port 57770 connected with 10.1.1.1 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 1.0 sec   262 MBytes  2.20 Gbits/sec
[  3]  1.0- 2.0 sec   299 MBytes  2.51 Gbits/sec
[  3]  2.0- 3.0 sec   271 MBytes  2.27 Gbits/sec
[  3]  3.0- 4.0 sec   247 MBytes  2.07 Gbits/sec
[  3]  4.0- 5.0 sec   290 MBytes  2.43 Gbits/sec
[  3]  5.0- 6.0 sec   292 MBytes  2.45 Gbits/sec
[  3]  6.0- 7.0 sec   223 MBytes  1.87 Gbits/sec
[  3]  7.0- 8.0 sec   243 MBytes  2.04 Gbits/sec
[  3]  8.0- 9.0 sec   234 MBytes  1.97 Gbits/sec
[  3]  9.0-10.0 sec   238 MBytes  2.00 Gbits/sec

Reported-by: William Tu <u9012063 at gmail.com>
Reported-at: https://mail.openvswitch.org/pipermail/ovs-dev/2019-November/365076.html
Signed-off-by: Yifeng Sun <pkusunyifeng at gmail.com>
Signed-off-by: 0-day Robot <robot at bytheb.org>

View the changeset: https://github.com/ovsrobot/ovs/compare/0c4d144a989a^...7784ce70d66d

View the full build log and details: https://travis-ci.org/ovsrobot/ovs/builds/627985349?utm_medium=notification&utm_source=email

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