This bug was fixed in the package neutron - 1:2014.1.5-0ubuntu5
---------------
neutron (1:2014.1.5-0ubuntu5) trusty; urgency=medium
* Backport performance fix by refactoring logging statements. (LP: #1414218):
- d/p/refactor-log-in-loop.patch: do not perform debug trace with each
iteration through the loop of ports, instead log it once at the end.
-- Billy Olsen <billy.ol...@canonical.com> Tue, 05 Jul 2016 15:07:28
-0700
** Changed in: neutron (Ubuntu Trusty)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1414218
Title:
Remove extraneous trace in linux/dhcp.py
Status in Ubuntu Cloud Archive:
Confirmed
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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