[Rdo-list] Revisited: Neutron Quickstart, ovs_use_veth and RHEL 6.4.

[Brent Eagles]

Hi Thomas,

You may recall a thread started by Perry from earlier this month with 
the title "Trying out Neutron Quickstart running into issues with netns 
(l2 agent and dhcp agent)" where the DHCP and L3 agents were complaining 
of RNETLINK resource busy type of errors when trying to set the MAC 
addr. The workaround was to enable ovs_use_veth. I had been stating that 
this was a required configuration for some time without knowing the 
correct reason why but Maru explained it to us later on, so everything 
is great in that respect. However... (there is always a "however", isn't 
there?)

One of our team was *not* having this issue. In fact everything has been 
working for him for some time and he has never touched that 
configuration item. It turns out he was getting updates from the RHEL 
6.5 composes build. After we discovered the differences, I downloaded 
the kernel and firmware rpms and installed them to a 6.4 VM and I also 
could get away without using the ovs_use_veth. We are doing some 
additional testing to see just how much works with this kind of setup 
(devstack, tempest, etc.). So far, it seems that whatever is changed 
between the openstack kernel and the one in the 6.5 composes addresses 
the issues that ovs_use_veth works around. Hopefully this info is of 
some use to you! I'm going to copy and preserve the current state of my 
VM so let me know if there is anything specific you want me to try with 
this configuration

Cheers,

Brent