[Bug 1414218] Re: Remove extraneous trace in linux/dhcp.py

[Corey Bryant]

** Also affects: cloud-archive/icehouse
   Importance: Undecided
       Status: New

** Changed in: cloud-archive
       Status: Confirmed => Invalid

** Changed in: cloud-archive/icehouse
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1414218

Title:
  Remove extraneous trace in linux/dhcp.py

Status in Ubuntu Cloud Archive:
  Invalid
Status in Ubuntu Cloud Archive icehouse series:
  Fix Committed
Status in neutron:
  Fix Released
Status in neutron juno series:
  Fix Released
Status in neutron package in Ubuntu:
  Fix Released
Status in neutron source package in Trusty:
  Fix Released

Bug description:
  [Impact]

  The debug tracepoint in Dnsmasq._output_hosts_file is extraneous and
  causes unnecessary performance overhead when creating lots (> 1000)
  ports at one time.

  The trace point is unnecessary since the data is being written to disk
  and the file can be examined in a worst case scenario. The added
  performance overhead is an order of magnitude in difference (~.5
  seconds versus ~.05 seconds at 1500 ports).

  [Test Case]

  1. Deploy OpenStack using neutron for networking
  2. Create 1500 ports
  3. Observe the performance degradation for each port creation.

  [Regression Potential]

  Minimal. This code has been running in stable/juno, stable/kilo, and
  above for awhile.

  [Other Questions]

  This is likely to occur in OpenStack deployments which have large
  networks deployed. The degradation is gradual, but the performance
  becomes unacceptable with large enough networks.

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