the 'ovs_use_veth' and 'veth_mtu' options should be deprecated

[Kevin Benton]

These options were here to support an old kernel bug that shouldn't be present in distros that ship Newton. These will cause an MTU mismatch because the MTU value of the networks they support aren't known at the time of wiring.

[Assaf Muller (amuller)]

I think we can delete these options without a deprecation cycle. These options are not relevant for CentOS 6, which is the oldest CentOS version capable of running a supported OpenStack version.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/285532

[Miguel Angel Ajo (mangelajo)]

My investigations, sadly, showed up that we may need the ovs_veth "patch ports" to provide min bandwidth guarantees, as, those patch ports are the single points collecting the traffic that goes in/out to a network.

ovs patch ports are not linux kernel primitives, and because of that, we cannot attach queues to them, and do QoS vodoo.

see [1] , [2], and [3]

[1] https://github.com/mangelajo/ovs-experiments/blob/master/qos/qos_complex_traffic_shapping.sh#L1
[2] https://github.com/mangelajo/ovs-experiments/blob/master/qos/qos_complex_traffic_shapping.sh#L55
[3] https://github.com/mangelajo/ovs-experiments/blob/master/qos/qos_complex_traffic_shapping.sh#L276

So, please let's keep them until I get to this, may be I can look into alternatives. Somebody told me about IMQ's but that's not merged in mainstream linux kernel, and I believe there was something similar in-kernel, but I haven't been able to find it yet.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/285532
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=850b4c025fa5652bfa474c78e7775d74fdb93df6
Submitter: Jenkins
Branch: master

commit 850b4c025fa5652bfa474c78e7775d74fdb93df6
Author: Kevin Benton <email address hidden>
Date: Wed Feb 24 11:28:28 2016 -0800

    Deprecate 'ovs_use_veth' and 'veth_mtu' options

    These were added to support an old kernel bug with
    patch ports in OVS. This should no longer be an issue
    with distros new enough ship Ocata.

    Closes-Bug: #1550501
    Change-Id: I8cd3d74f4d7dbe57fbff180d344f21534d590ce1

[sean mooney (sean-k-mooney)]

as the change was reverted this bug should be reopened.
https://review.openstack.org/#/c/306807/

[Doug Hellmann (doug-hellmann)]

This issue was fixed in the openstack/neutron 9.0.0.0b1 development milestone.

[OpenStack Infra (hudson-openstack)]

Change abandoned by Bence Romsics (<email address hidden>) on branch: master
Review: https://review.openstack.org/323310