[ovs-build] Passed: ovsrobot/ovs#1580 (series_130266 - 1e4e2db)

[Travis CI]

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

Build: #1580
Status: Passed

Duration: 1 hr, 0 mins, and 9 secs
Commit: 1e4e2db (series_130266)
Author: William Tu
Message: netdev-afxdp: Add need_wakeup supprt.

The patch adds support for using need_wakeup flag in AF_XDP rings.
A new option, use_need_wakeup, is added. When this option is used,
it means that OVS has to explicitly wake up the kernel RX, using poll()
syscall and wake up TX, using sendto() syscall. This feature improves
the performance by avoiding unnecessary sendto syscalls for TX.
For RX, instead of kernel always busy-spinning on fille queue, OVS wakes
up the kernel RX processing when fill queue is replenished.

The need_wakeup feature is merged into Linux kernel 5.3.0-rc1 and OVS
enables it by default. Running the feature before this version causes
xsk bind fails, please use options:use_need_wakeup=false to disable it.
If users enable it but runs in an older version of libbpf, then the
need_wakeup feature has no effect, and a warning message is logged.

For virtual interface, it's better set use_need_wakeup=false, since
the virtual device's AF_XDP xmit is synchronous: the sendto syscall
enters kernel and process the TX packet on tx queue directly.

I tested on kernel 5.3.0-rc3 using its libbpf.  On Intel Xeon E5-2620
v3 2.4GHz system, performance of physical port to physical port improves
from 6.1Mpps to 7.3Mpps. Testing on 5.2.0-rc6 using libbpf from 5.3.0-rc3
does not work due to libbpf API change. Users have to use the older
libbpf for older kernel.

Suggested-by: Ilya Maximets <i.maximets at samsung.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/1e4e2db471c4

View the full build log and details: https://travis-ci.org/ovsrobot/ovs/builds/583804536?utm_medium=notification&utm_source=email

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