linuxbridge agent is using too much memory

[Darragh O'Reilly]

When vxlan is configured:

$ ps aux | grep linuxbridge
vagrant 21051 3.2 28.9 504764 433644 pts/3 S+ 09:08 0:02 python /usr/local/bin/neutron-linuxbridge-agent --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/plugins/ml2/ml2_conf.ini

A list with over 16 million numbers is created here:

 for segmentation_id in range(1, constants.MAX_VXLAN_VNI + 1):

https://github.com/openstack/neutron/blob/b5859998bc662569fee4b34fa079b4c37744de2c/neutron/plugins/linuxbridge/agent/linuxbridge_neutron_agent.py#L526

and does not seem to be garbage collected for some reason.

Using xrange instead:

$ ps -aux | grep linuxb
vagrant 7397 0.1 0.9 106412 33236 pts/10 S+ 09:19 0:05 python /usr/local/bin/neutron-linuxbridge-agent --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/plugins/ml2/ml2_conf.ini

[Darragh O'Reilly (darragh-oreilly)]

https://review.openstack.org/#/c/134892/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/134892
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=0bf69ad80fb77773e767e116357cf6e1666b3f5d
Submitter: Jenkins
Branch: master

commit 0bf69ad80fb77773e767e116357cf6e1666b3f5d
Author: Darragh O'Reilly <email address hidden>
Date: Mon Nov 17 10:20:58 2014 +0000

    linuxbridge-agent: make vxlan unicast check more efficent

    A list with the full range of vxlan VNIs (1 to 2**24) was using
    over 300MB of memory. This patch uses xrange instead of range.

    Closes-Bug: #1393362
    Change-Id: I21ccab758e7911712690fd5e732f64361e809264

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/juno
Review: https://review.openstack.org/137087

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/137087
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=56b0029014ff7e844c2fde45f7b52b7f115757e8
Submitter: Jenkins
Branch: stable/juno

commit 56b0029014ff7e844c2fde45f7b52b7f115757e8
Author: Darragh O'Reilly <email address hidden>
Date: Mon Nov 17 10:20:58 2014 +0000

    linuxbridge-agent: make vxlan unicast check more efficent

    A list with the full range of vxlan VNIs (1 to 2**24) was using
    over 300MB of memory. This patch uses xrange instead of range.

    Closes-Bug: #1393362
    Change-Id: I21ccab758e7911712690fd5e732f64361e809264
    (cherry picked from commit 0bf69ad80fb77773e767e116357cf6e1666b3f5d)