Public bug reported: Config option 'use_veth_interconnection' should be deprecated. Instead we can always use Open vSwitch patch ports.
The discussion started in a review here: https://review.openstack.org/#/c/318317/2 openstack/neutron/doc/source/devref/openvswitch_agent.rst line 471 AFAICT the use of veth pairs was always a fallback when sufficiently new ovs was not available from distro packages. Since veth pairs have always worse packet forwarding performance than ovs patch cables it makes no sense using them if ovs patch cables are available. If we no longer support veth pairs, the agent code can be simplified. We think providing the veth fallback is no longer relevant. Open vSwitch release notes state this (http://openvswitch.org/releases/NEWS-2.5.0): v1.10.0 - 01 May 2013 --------------------- ... - Patch ports no longer require kernel support, so they now work with FreeBSD and the kernel module built into Linux 3.3 and later. For example for Ubuntu this means veth is not needed in 14.04+. I opened this bug to separate this conversation from the above review. To get feedback if anybody still uses veth pairs. Shall we deprecate 'use_veth_interconnection'? If yes, what should be the deprecation timeline? ** Affects: neutron Importance: Undecided Status: New ** Tags: ovs rfe ** Project changed: tempest => neutron -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to neutron. https://bugs.launchpad.net/bugs/1587296 Title: ovs-agent: use_veth_interconnection is not needed anymore Status in neutron: New Bug description: Config option 'use_veth_interconnection' should be deprecated. Instead we can always use Open vSwitch patch ports. The discussion started in a review here: https://review.openstack.org/#/c/318317/2 openstack/neutron/doc/source/devref/openvswitch_agent.rst line 471 AFAICT the use of veth pairs was always a fallback when sufficiently new ovs was not available from distro packages. Since veth pairs have always worse packet forwarding performance than ovs patch cables it makes no sense using them if ovs patch cables are available. If we no longer support veth pairs, the agent code can be simplified. We think providing the veth fallback is no longer relevant. Open vSwitch release notes state this (http://openvswitch.org/releases/NEWS-2.5.0): v1.10.0 - 01 May 2013 --------------------- ... - Patch ports no longer require kernel support, so they now work with FreeBSD and the kernel module built into Linux 3.3 and later. For example for Ubuntu this means veth is not needed in 14.04+. I opened this bug to separate this conversation from the above review. To get feedback if anybody still uses veth pairs. Shall we deprecate 'use_veth_interconnection'? If yes, what should be the deprecation timeline? To manage notifications about this bug go to: https://bugs.launchpad.net/neutron/+bug/1587296/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : [email protected] Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp
