Public bug reported: SRU Justification: [Impact] * There is high latency when testing latency between VMs in an Openstack environment. * This affects OVS in P/Q.
[Test Case] * Setup Openstack. * On a compute node create at least 15 tenants and add 50 instances (more instances show larger latencies). * From the Neutron node ping to a particular instance: ip netns exec qrouter-<uuid> ping -c 1 <instance ip> * We expect this latency to be similar to the latency from not using OVS. [Regression Potential] * The following patch from upstream OVS solves the issue: c37d4da4f0fd0190ea8fef97399df6d27ebf6ee2. * It requires 755be9ea9d7250edd37e1056362e08a7436f6983 to be backported as well since the 1.4.6 still uses sysfs to get carrier info (/sys/class/net/%s/carrier) instead of ioctl. Once we are using ioctls the second patch c37d4da4f0fd0190ea8fef97399df6d27ebf6ee2 reduces the number of times the ioctl is called from netdev_get_carrier(). * There has been testing already done with these two patches applied on top of 1.4.6 in precise. ** Affects: openvswitch (Ubuntu) Importance: Undecided Status: Fix Released ** Affects: openvswitch (Ubuntu Precise) Importance: Medium Assignee: Chris J Arges (arges) Status: In Progress ** Affects: openvswitch (Ubuntu Quantal) Importance: Medium Assignee: Chris J Arges (arges) Status: In Progress ** Also affects: openvswitch (Ubuntu Precise) Importance: Undecided Status: New ** Also affects: openvswitch (Ubuntu Quantal) Importance: Undecided Status: New ** Changed in: openvswitch (Ubuntu) Status: New => Fix Released ** Changed in: openvswitch (Ubuntu Precise) Assignee: (unassigned) => Chris J Arges (arges) ** Changed in: openvswitch (Ubuntu Quantal) Assignee: (unassigned) => Chris J Arges (arges) ** Changed in: openvswitch (Ubuntu Precise) Importance: Undecided => Medium ** Changed in: openvswitch (Ubuntu Quantal) Importance: Undecided => Medium ** Changed in: openvswitch (Ubuntu Precise) Status: New => Triaged ** Changed in: openvswitch (Ubuntu Precise) Status: Triaged => In Progress ** Changed in: openvswitch (Ubuntu Quantal) Status: New => In Progress -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openvswitch in Ubuntu. https://bugs.launchpad.net/bugs/1280370 Title: high latency between VMs in openstack using OVS To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openvswitch/+bug/1280370/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs