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
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https://bugs.launchpad.net/bugs/1280370
Title:
high latency between VMs in openstack using OVS
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