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I met a similar problem but only with VM tap (not with router or DHCP ports).
We proposed a fix [1] we attached with an opening bug [2].
The fix isn't yet ready (status WIP). Another patch [3] make a lot
change on this part of code (OVS agent interface loop). So we prefer
to wait it was finished to rebase our proposition on it.

[1] https://review.openstack.org/#/c/66375/
[2] https://bugs.launchpad.net/nova/+bug/1240849
[3] https://review.openstack.org/#/c/61964/

Édouard.

On Fri, Jan 17, 2014 at 5:35 PM, Jay Pipes <jaypipes at gmail.com> wrote:
> On Fri, 2014-01-17 at 17:58 +0200, Jesse Pretorius wrote:
>> On 17 January 2014 17:39, Jay Pipes <jaypipes at gmail.com> wrote:
>>         I believe you may want to upgrade to OVS 1.11+ and see if the
>>         problem
>>         persists.
>>
>>
>> Thanks Jay, although I don't see where that package is available for
>> Precise? Precise-updates has the version that I have. Saucy seems to
>> have 1.10. It would seem that the only option is to compile from
>> source.
>
> Yup :( That's exactly what we do in our Chef cookbooks...
>
>> Why specifically 1.11+?
>
> We discovered bugs in 1.04 around how the L2 GRE mesh was created that
> allowed a single tenant to inadvertently flood the mesh with traffic and
> effectively bring the whole tenant networking down. No idea if it's
> related to what you're seeing, but we moved to OVS 1.11+ and did not
> have the same issues, and performance/scalability was generally much
> better.
>
> Best,
> -jay
>
>
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