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[OpenStack Infra <1830456@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/661522
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=00eb6f26f6165a00d647d2bf35fb7996534cfc09
Submitter: Zuul
Branch:    master

commit 00eb6f26f6165a00d647d2bf35fb7996534cfc09
Author: shenjiatong <yshxxsjt715@xxxxxxxxx>
Date:   Mon May 27 11:26:49 2019 +0800

    improve dvr port update under large scale deployment
    
    update port may takes an excessive number of seconds
    to complete if dvr routers are running on more than 100
    compute nodes. This patch tries to save some time by removing
    unnecessary calls inside looping through hosts.
    
    Change-Id: Ide740e0c5c43c2d2b842460a37c8ce125da12b28
    Closes-Bug: #1830456


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

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https://bugs.launchpad.net/bugs/1830456

Title:
  dvr router slow response during port update

Status in neutron:
  Fix Released

Bug description:
  We are having a distributed router which used by hundreds of virtual
  machines scattered across around 150 compute nodes. When nova sends
  port update request to neutron, it will generally taking nearly 4 min
  to complete.

  Neutron version is openstack Queens 12.0.5.

  I found the following log entries printed by neutron-server,

  2019-05-25 05:24:16,285.285 11834 INFO neutron.wsgi [req-xxxx xxxxx -
  default default] x.x.x.x "PUT
  /v2.0/ports/8c252d91-741a-4627-9600-916d1da5178f HTTP/1.1" status: 200
  len: 0 time: 233.6103470

  You can see it takes around 240 seconds to finish request.

  Right now I am suspecting this code snippet
  https://github.com/openstack/neutron/blob/de59a21754747335d0d9d26082c7f0df105a30c9/neutron/db/l3_dvrscheduler_db.py#L139
  leads to the issue.

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