[Bug 1897483] Re: With hardware offloading enabled, OVS logs are spammed with netdev_offload_tc ERR messages

[Trent Lloyd]

There is an indication in the below RHBZ this can actually prevent
openvswitch from working properly as it loses too much CPU time to this
processing in large environments (100s or 1000s of ports)

https://bugzilla.redhat.com/show_bug.cgi?id=1737982

Seems to be a rejected upstream patch here, unclear if one was later accepted, we shoudl check for it:
https://lists.linuxfoundation.org/pipermail/ovs-dev/2019-March/357348.html

And potentially prioritise a fix for this.

** Tags added: sts

** Bug watch added: Red Hat Bugzilla #1737982
   https://bugzilla.redhat.com/show_bug.cgi?id=1737982

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https://bugs.launchpad.net/bugs/1897483

Title:
  With hardware offloading enabled, OVS logs are spammed with
  netdev_offload_tc ERR messages

Status in OpenStack neutron-openvswitch charm:
  Invalid
Status in openvswitch package in Ubuntu:
  New

Bug description:
  If neutron-openvswitch charm is deployed with enable-hardware-
  offload=true ovs-vswitchd.log are flooded with messages like those:

  2020-09-27T21:55:40.460Z|28192|netdev_offload_tc(revalidator625)|ERR|Dropped 11 log messages in last 1 seconds (most recently, 1 seconds ago) due to excessive rate
  2020-09-27T21:55:40.460Z|28193|netdev_offload_tc(revalidator625)|ERR|dump_create: failed to get ifindex for qr-66e28056-8f: Operation not supported
  2020-09-27T21:55:41.461Z|28194|netdev_offload_tc(revalidator625)|ERR|Dropped 11 log messages in last 1 seconds (most recently, 1 seconds ago) due to excessive rate
  2020-09-27T21:55:41.461Z|28195|netdev_offload_tc(revalidator625)|ERR|dump_create: failed to get ifindex for qr-66e28056-8f: Operation not supported
  2020-09-27T21:55:42.461Z|28196|netdev_offload_tc(revalidator625)|ERR|Dropped 11 log messages in last 1 seconds (most recently, 1 seconds ago) due to excessive rate
  2020-09-27T21:55:42.461Z|28197|netdev_offload_tc(revalidator625)|ERR|dump_create: failed to get ifindex for qr-66e28056-8f: Operation not supported
  2020-09-27T21:55:43.462Z|28198|netdev_offload_tc(revalidator625)|ERR|Dropped 11 log messages in last 1 seconds (most recently, 1 seconds ago) due to excessive rate
  2020-09-27T21:55:43.462Z|28199|netdev_offload_tc(revalidator625)|ERR|dump_create: failed to get ifindex for qr-66e28056-8f: Operation not supported
  2020-09-27T21:55:44.464Z|28200|netdev_offload_tc(revalidator625)|ERR|Dropped 11 log messages in last 1 seconds (most recently, 1 seconds ago) due to excessive rate
  2020-09-27T21:55:44.464Z|28201|netdev_offload_tc(revalidator625)|ERR|dump_create: failed to get ifindex for qr-66e28056-8f: Operation not supported

  The messages are possibly harmful, but there are thousands of them per
  hour. They can be disabled by executing:

  sudo ovs-appctl vlog/set netdev_offload_tc:OFF

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