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[Adit Sarfaty <asarfaty@xxxxxxxxxx>]

Public bug reported:

When the QoS plugin is enabled, get_ports for about 10K ports takes over 10 minutes.
removing _extend_port_resource_request which was added in https://review.opendev.org/#/c/590363/
reduces the time to around 3 minutes only.
This was tested with stable/stein

The "blame" is with the code that retrieves the network object for each
port (unless the port was assigned with a qos policy):
https://opendev.org/openstack/neutron/src/branch/stable/stein/neutron/services/qos/qos_plugin.py#L103

This code should be improved.
Another partial fix can be to skip _extend_port_resource_request in case the driver does not support minimum-bw rules

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1835369

Title:
  QoS plugin slows down get_ports operation

Status in neutron:
  New

Bug description:
  When the QoS plugin is enabled, get_ports for about 10K ports takes over 10 minutes.
  removing _extend_port_resource_request which was added in https://review.opendev.org/#/c/590363/
  reduces the time to around 3 minutes only.
  This was tested with stable/stein

  The "blame" is with the code that retrieves the network object for
  each port (unless the port was assigned with a qos policy):
  https://opendev.org/openstack/neutron/src/branch/stable/stein/neutron/services/qos/qos_plugin.py#L103

  This code should be improved.
  Another partial fix can be to skip _extend_port_resource_request in case the driver does not support minimum-bw rules

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