[ovs-build] Passed: ovsrobot/ovs#2275 (series_160371 - d1a518a)

[Travis CI]

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

Build: #2275
Status: Passed

Duration: 56 mins and 54 secs
Commit: d1a518a (series_160371)
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, it can work only if your kernel can
support, this has been verified on Ubuntu 18.04 5.3.0-40-generic
, if you find the performance is very poor, please turn off tso
for veth interfces in case userspace-tso-enable is set to true.

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/commit/d1a518a2adc3

View the full build log and details: https://travis-ci.org/ovsrobot/ovs/builds/654436845?utm_medium=notification&utm_source=email

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