Performance degradation of scenario "create and delete subnets"

[Andriy Kurilin]

Rally has a scenario NeutronNetworks.create_and_delete_subnets .
Logic of setUp method of scenario:
 - create network

Logic of scenario:
 - create 2 subnets in network
 - delete subnets

We configured this scenario to be launched with concurrency 10. Yesturday, we got first failure(like [1]).
First failed results of jenkins was posted at Sep 12 8:08 PM (UTC +3).
Last found success jobs was started at Sep 12 3:32 PM (UTC +3)

Recheck did not help(example https://review.openstack.org/#/c/362924/ gate-rally-dsvm-neutron-rally job)

Workaround: Reduce concurrency to 5.

[1] - http://logs.openstack.org/24/362924/2/check/gate-rally-dsvm-neutron-rally/39d985b/rally-plot/results.html.gz#/NeutronNetworks.create_and_delete_subnets/overview

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.openstack.org/369410

[Khushbuparakh (khushbuparakh)]

Why is the failure is it because the new subnets that are being created matches with the existing subnets in the list.

[OpenStack Infra (hudson-openstack)]

Change abandoned by Armando Migliaccio (<email address hidden>) on branch: master
Review: https://review.openstack.org/369410
Reason: This review is > 4 weeks without comment, and failed Jenkins the last time it was checked. We are abandoning this for now. Feel free to reactivate the review by pressing the restore button and leaving a 'recheck' comment to get fresh test results.

[Armando Migliaccio (armando-migliaccio)]

I recall that Kevin filed a bunch of fixes to bring rally back to sanity right about the time for feature freeze [2]. The rally job is a bit of a roller coaster so it's difficult to confirm this without further evidence.

[1] https://launchpad.net/neutron/+milestone/newton-rc1
[2] http://grafana.openstack.org/dashboard/db/neutron-failure-rate?panelId=11&fullscreen

[Khushbuparakh (khushbuparakh)]

I would like to work on it getting more details about reasons for failure and new fixes.

[Launchpad Janitor (janitor)]

[Expired for neutron because there has been no activity for 60 days.]