[ovs-build] Passed: ovsrobot/ovs#2345 (series_162870 - 03407f9)

Travis CI builds at travis-ci.org
Fri Mar 6 15:51:10 UTC 2020

Build Update for ovsrobot/ovs

Build: #2345
Status: Passed

Duration: 49 mins and 20 secs
Commit: 03407f9 (series_162870)
Author: Yi Yang
Message: Use TPACKET_V3 to accelerate veth for userspace datapath

We can avoid high system call overhead by using TPACKET_V3
and using DPDK-like poll to receive and send packets (Note: send
still needs to call sendto to trigger final packet transmission).

>From Linux kernel 3.10 on, TPACKET_V3 has been supported,
so all the Linux kernels current OVS supports can run
TPACKET_V3 without any problem.

I can see about 30% performance improvement for veth compared to
last recvmmsg optimization if I use TPACKET_V3, it is about 1.98
Gbps, but it was 1.47 Gbps before.

TPACKET_V3 can support TSO, but its performance isn't good because
of TPACKET_V3 kernel implementation issue, so it falls back to
recvmmsg in case userspace-tso-enable is set to true, but its
performance is better than recvmmsg in case userspace-tso-enable is
set to false, so just use TPACKET_V3 in that case.

Signed-off-by: Yi Yang <yangyi01 at inspur.com>
Co-authored-by: William Tu <u9012063 at gmail.com>
Signed-off-by: William Tu <u9012063 at gmail.com>
Signed-off-by: 0-day Robot <robot at bytheb.org>

View the changeset: https://github.com/ovsrobot/ovs/compare/4cf89cb07424^...03407f9861ec

View the full build log and details: https://travis-ci.org/ovsrobot/ovs/builds/659198187?utm_medium=notification&utm_source=email


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