.Enhanced `os-vif` OVS plugin improves network performance on OVS interfaces Previously, a bug fix was made to OVS that changed the application of the kernel's default QOS policy to OVS ports. This fix was applied to 17.1 but not to 18.0. As a result, a regression in the network configuration for OVS interfaces negatively impacted network performance of Openstack instances when using kernel OVS. With this update, the `os-vif` OVS plugin has been enhanced to improve network performance on OVS interfaces by using the linux-noop QOS policy by default. This can still be overridden by neutron QOS policies. To apply the update, restart or move the instance to recreate the port with a hard reboot, perform a detach followed by an attach operation, or perform a live migrate operation.