[ovs-dev] [PATCH ovn branch-21.09 0/3] Improve Load Balancer performance.

Dumitru Ceara dceara at redhat.com
Tue Nov 2 19:30:10 UTC 2021

This series backports the load balancer performance improvements to
stable branch-21.09.

- patch 1/3 changes the way ARP responder flows are generated for load
  balancer VIPs, using an address set, making SB updates incremental
  and also reducing memory usage on the SB server side.
- patch 2/3 introduces a new feature, Load_Balancer_Group, which
  simplifies load balancer configuration in large scale scenarios and
  at the same time improves performance due to the large reduction in
  database refereces between rows.
- patch 3/3 is a follow up fix of a bug originally introduced by
  patch 1/3.

Usually new features and performance fixes are not to be backported to
stable branches, however due to the (mis)alignment of upstream and
downstream release schedules, and due to the fact that ovn-kubernetes
requires a database table to be part of a schema that's tagged in a
release in ovn-org/ovn repo, if load balancer groups would be available
only starting with v21.12.0 then downstream ovn-kubernetes (and OpenShift)
will not be able to consume the feature for two release cycles (~6 months).

On the other hand the feature itself is quite contained, doesn't break
backwards compatibility, and, when used, hugely improves some CMSs
(OpenShift) load balancer use cases.

Dumitru Ceara (3):
      northd: Use address sets for ARP responder flows for VIPs.
      nb: Add support for Load_Balancer_Groups.
      northd: Always generate valid load balancer address set names.

 NEWS                  |    2 
 northd/northd.c       |  334 +++++++++++++++++++++++++++++++++----------------
 ovn-nb.ovsschema      |   24 +++-
 ovn-nb.xml            |   37 +++++
 tests/ovn-northd.at   |  293 ++++++++++++++++++++++++++++++++++---------
 utilities/ovn-nbctl.c |    3 
 6 files changed, 517 insertions(+), 176 deletions(-)

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