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[OpenStack Infra <2109388@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/c/openstack/neutron/+/948456
Committed: https://opendev.org/openstack/neutron/commit/2c35dd53f209f60ca60b8a2c077d97bb0c4c7d9e
Submitter: "Zuul (22348)"
Branch:    master

commit 2c35dd53f209f60ca60b8a2c077d97bb0c4c7d9e
Author: Rodolfo Alonso Hernandez <ralonsoh@xxxxxxxxxx>
Date:   Tue Apr 29 15:55:34 2025 +0000

    [OVN] Only update the MTU of the router GW LRPs
    
    When a new internal network is added to a router, the GW LRP (or LRPs)
    MTU value is updated, matching the lowest MTU of all networks connected
    to this router.
    
    This patch is updating the method ``set_gateway_mtu`` to be called only
    for a specific router and update only the router GW LRPs.
    
    Closes-Bug: #2109388
    Change-Id: Ic7807a440b479c0fa08c6d13813cd2a81eff9bb1


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/2109388

Title:
  [OVN] Slow "router add interface" when MTU differs and
  ovn_emit_need_to_frag=true

Status in neutron:
  Fix Released

Bug description:
  We currently have an external provider network A (VLAN) MTU 1500 with
  about 100 routers using that external network A.

  - case 1: I set ovn_emit_need_to_frag=False, then I perform an action
  to add 1 router interface with network type geneve MTU 6000 with
  completion time ~6 seconds

  - case 2: I set ovn_emit_need_to_frag=true, then I perform an action
  to add 1 router interface with network type geneve MTU 6000 with
  completion time ~50 seconds

  After I found out that neutron has proceeded to update the MTU for all
  LRPs belonging to the router using external network A, not just the
  router that I performed the action on, which resulted in a very long
  time to add the router interface.

  Environment:

  OVN: 24.09.0
  OPENSTACK: 2024.2
  OS: UBUNTU 24.04

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