I've spent the last two days trying to reproduce these problems on an
OpenStack Cloud with three gateway/network units, each with 8 cores and
16G of RAM; I have 99 routers configured on the cloud, plumbed into a
shared external provider network, and I've been switching them between
ha and non-ha configuration continually for the last 24 hours using:
openstack router set --disable $router_id
openstack router set --{no-}ha $router_id
openstack router set --enable $router_id
Routers successfully switched between HA and non-HA mode, with
keepalived, netns and ovs ports being tidied as appropriate.
We think we saw issues with ovs performance when the db contained a
large number of dangling ovs interfaces on br-int, so I loaded on of my
units up with 400 dangling ovs instances.
I'll run the switching again for a while and see if that exacerbates
things sufficiently to cause the same issue again.
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https://bugs.launchpad.net/bugs/1749425
Title:
Neutron integrated with OpenVSwitch drops packets and fails to
plug/unplug interfaces from OVS on router interfaces at scale
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