[ovs-build] Failed: ovsrobot/ovs#2205 (series_154372 - 6efc23a)

[Travis CI]

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

Build: #2205
Status: Failed

Duration: 35 mins and 18 secs
Commit: 6efc23a (series_154372)
Author: Yi Yang
Message: Use TPACKET_V1/V2/V3 to accelerate veth for DPDK datapath

We can avoid high system call overhead by using TPACKET_V1/V2/V3
and use DPDK-like poll to receive and send packets (Note: send
still needs to call sendto to trigger final packet transmission).

I can see about 30% improvement compared to last recvmmsg
optimization if I use TPACKET_V3. TPACKET_V1/V2 is worse than
TPACKET_V3, but it still can improve about 20%.

For veth, it is 1.47 Gbps before this patch, it is about 1.98
Gbps after applied this patch. But it is about 4.00 Gbps if we
use af_packet for veth, the bottle neck lies in ovs-vswitchd
thread, it will handle too many things for every loop (as below)
, so it can't work very efficintly as pmd_thread.

        memory_run();
        bridge_run();
        unixctl_server_run(unixctl);
        netdev_run();

        memory_wait();
        bridge_wait();
        unixctl_server_wait(unixctl);
        netdev_wait();
        poll_block();

In the next step, it will be better if let pmd_thread to handle
tap and veth interface.

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/d7b55c5c941b^...6efc23a19513

View the full build log and details: https://travis-ci.org/ovsrobot/ovs/builds/639827140?utm_medium=notification&utm_source=email

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