DNS lookup code in get_ports needs to be optimized

[Ryan Moats]

Kilo's get_ports code can be found at http://pastebin.com/PjVG2KFt while Liberty's get_ports code can be found at http://pastebin.com/wpmTx8H7

The difference in the two code paths (the DNS code) leads to an execution time difference shown in http://ibin.co/2G72PkX2eshD

[Carl Baldwin (carl-baldwin)]

Miguel, let's take some time next week to look at how to optimize the DNS code path in get_port(s). I think we should be able to figure this out.

[Kyle Mestery (mestery)]

Leaving this in Liberty for now, as the optimization seems to be worth the wait.

[Miguel Lavalle (minsel)]

A tentative approach to fix this bug has been discussed with Carl Baldwin. Plan is to have first patchset for review up in Gerrit by 9/22

[Miguel Lavalle (minsel)]

Approach is to eliminate the queries to the DB for subnets when handling the DNS assignment for ports

[Miguel Lavalle (minsel)]

9/21 EOD status : Making good progress. Patchset will be in Gerrit on 9/22

[Kyle Mestery (mestery)]

Will evaluate the patch EOD 9-22 and decide if it is an RC blocker.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/226535

[OpenStack Infra (hudson-openstack)]

Change abandoned by Miguel Lavalle (<email address hidden>) on branch: master
Review: https://review.openstack.org/226535

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/226581

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/226581
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=2d68a0ed42d3eb3d6187fb5ae78b7b38001dcfdb
Submitter: Jenkins
Branch: master

commit 2d68a0ed42d3eb3d6187fb5ae78b7b38001dcfdb
Author: Miguel Lavalle <email address hidden>
Date: Tue Sep 22 17:22:31 2015 -0500

    Eliminate autoaddress check for DNS integration

    The autoaddress check for DNS integartion is not required anymore. It is
    removed from the DB plugin. This check was being performed to reflect
    incorrect functionality in the DHCP agent as indicated in bug
    https://bugs.launchpad.net/neutron/+bug/1498665

    Change-Id: I4b00618c328567f998765ed9a023c4c50d950b2b
    Closes-Bug: #1497450

[Ryan Moats (rmoats)]

Confirmed that this fix addresses the performance issue - Thanks!