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[norman shen <1830456@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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.

** Affects: neutron
     Importance: Undecided
         Status: New

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

Title:
  dvr router slow response during port update

Status in neutron:
  New

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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