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[Han Guangyu <2019012@xxxxxxxxxxxxxxxxxx>]

https://bugs.launchpad.net/neutron/+bug/1911462

This bug has been resolveed in Wallaby， close it

** Changed in: neutron
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/2019012

Title:
  When num of port mappings is substantial, the response time of List
  API so slow

Status in neutron:
  Fix Released

Bug description:
  Conditions：

  I have a Victoria cluster with 1 controller node(also have
  nova-compute service) and two compute node. ALL node boasts 128 CPU
  cores and 512GB of memory.
  I'm a  super-user. I have this problem when trying the port forwarding feature.
  I established 1500 port mappings for a single floating IP A. At this
  point, the response time for the "List Floating IP Port Forwardings"
  API[1] becomes remarkably slow, approaching a duration of 9 minutes.

  [1] https://docs.openstack.org/api-ref/network/v2/index.html#list-
  floating-ip-port-forwardings

  Step-by-step reproduction steps：

  1. Create a floating ip

  such as 10.10.16.10

  2. At this time, the Port Forwarding List API response time is normal

  ```shell
  floating_ip=10.10.16.10
  openstack floating ip port forwarding list $floating_ip
  ```

  3. create 1500 port forwarding for this floating ip

  ```shell
  cat > creat-port-forwarding.sh << EOF
  #!/bin/bash

  floating_ip=10.10.16.10

  source ./admin-openrc

  for (( i=11001; i<11500; i++ )); do
          openstack floating ip port forwarding create --internal-ip-address 10.100.1.100 --port 72d49500-ba6e-4e82-bdc2-a72a836ef83e --internal-protocol-port \$i --external-protocol-port \$i --protocol tcp \$floating_ip
  done
  EOF

  chmod +x create-port-forwarding.sh
  ./create-port-forwarding.sh
  ```

  4. At this point, the response time for the "List Floating IP Port Forwardings"
  API becomes remarkably slow, approaching a duration of 9 minutes.

  ```shell
  floating_ip=10.10.16.10
  openstack floating ip port forwarding list $floating_ip
  ```

  Version:
  Victoria
  rpm install

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