[ovs-build] Passed: ovsrobot/ovs#3623 (series_232162 - 832cf67)

[Travis CI]

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

Build: #3623
Status: Passed

Duration: 11 mins and 37 secs
Commit: 832cf67 (series_232162)
Author: Michal Kazior
Message: netlink: ignore IFLA_WIRELESS events

Some older wireless drivers - ones relying on the
old and long deprecated wireless extension ioctl
system - can generate quite a bit of IFLA_WIRELESS
events depending on their configuration and
runtime conditions. These are delivered as
RTNLGRP_LINK via RTM_NEWLINK messages.

These tend to be relatively easily identifiable
because they report the change mask being 0. This
isn't guaranteed but in practice it shouldn't be a
problem. None of the wireless events that I ever
observed actually carry any unique information
about netdev states that ovs-vswitchd is
interested in. Hence ignoring these shouldn't
cause any problems.

These events can be responsible for a significant
CPU churn as ovs-vswitchd attempts to do plenty of
work for each and every netlink message regardless
of what that message carries. On low-end devices
such as consumer-grade routers these can lead to a
lot of CPU cycles being wasted, adding up to heat
output and reducing performance.

It could be argued that wireless drivers in
question should be fixed, but that isn't exactly a
trivial thing to do. Patching ovs seems far more
viable while still making sense.

Signed-off-by: Michal Kazior <michal at plume.com>
Signed-off-by: 0-day Robot <robot at bytheb.org>

View the changeset: https://github.com/ovsrobot/ovs/commit/832cf67b78a5

View the full build log and details: https://travis-ci.com/github/ovsrobot/ovs/builds/218989645?utm_medium=notification&utm_source=email


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