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[Swaminathan Vasudevan <swaminathan.vasudevan@xxxxxx>]

Public bug reported:

At scale when we have 100s of compute Node and 1000s of VM in networks that are routed by Distributed Virtual Router, we are seeing a control plane performance issue.
It takes a while for all the routers to be schedule in the Nodes.

The _schedule_router calls _get_candidates, and it internally calls
get_l3_agent_candidates. In the case of the DVR Routers, all the active
agents are passed to the get_l3_agent_candidates which iterates through
the agents and for each agent it tries to find out if there are any
dvr_service ports available in the routed subnet.

This might be taking lot more time.

So we need to figure out the issue and reduce the time taken for the
scheduling.

** Affects: neutron
     Importance: Undecided
     Assignee: Swaminathan Vasudevan (swaminathan-vasudevan)
         Status: In Progress


** Tags: l3-dvr-backlog

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https://bugs.launchpad.net/bugs/1513678

Title:
  At scale router scheduling takes a long time with DVR routers with
  multiple compute nodes hosting thousands of VMs

Status in neutron:
  In Progress

Bug description:
  At scale when we have 100s of compute Node and 1000s of VM in networks that are routed by Distributed Virtual Router, we are seeing a control plane performance issue.
  It takes a while for all the routers to be schedule in the Nodes.

  The _schedule_router calls _get_candidates, and it internally calls
  get_l3_agent_candidates. In the case of the DVR Routers, all the
  active agents are passed to the get_l3_agent_candidates which iterates
  through the agents and for each agent it tries to find out if there
  are any dvr_service ports available in the routed subnet.

  This might be taking lot more time.

  So we need to figure out the issue and reduce the time taken for the
  scheduling.

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