[Openstack-operators] What is the best production kernel, openvswitch combination?

Simon Pasquier simon.pasquier at bull.net
Tue Feb 11 16:20:53 UTC 2014

Hi Jesse,

I've run into the same kernel panic you experienced [1] and 
openvswitch-1.4.6 didn't help either. I don't have the issue with kernel 
3.2.0-56 so I'm sticking with that version.
I've no time to investigate further in the short term but I'll keep you 



[1] https://bugs.launchpad.net/openstack-cisco/+bug/1260334

On 09/02/2014 12:08, Jesse Pretorius wrote:
> Hi everyone,
> We have a production cloud system running on Ubuntu 12.04 LTS with
> Openstack Grizzly from the Ubuntu Cloud Archive. We're using the stock
> Openvswitch from the Precise repo.
> Current levels:
> kernel 3.2.0-54
> openvswitch 1.4.0-1ubuntu1.5
> openstack 1:2013.1.4-0ubuntu1~cloud0
> Recently I tried doing a dist-upgrade to kernel 3.2.0-58. After the
> reboot everything seemed fine, then the quantum ovs agent started,
> initiated the gre tunnels and the kernel panicked. Not good. As it turns
> out, this has been picked up by others:
> https://bugs.launchpad.net/openstack-cisco/+bug/1260334
> https://bugs.launchpad.net/ubuntu/precise/+source/openvswitch/+bug/1262692
> So, the simplest solution appeared to be to try updating to
> openvswitch-1.4.6 from precise-proposed. I tried that (admittedly
> keeping the kernel version static) on a network node and it borked again.
> Alright, so perhaps I should just let sleeping dogs lie and leave the
> software levels as they are. That'd be great except that as they are I'm
> experiencing issues with port tagging not working properly for router
> internal ports and dhcp service ports:
> https://bugs.launchpad.net/neutron/+bug/1269795
> So, I'd like to know from anyone still reading - what levels of kernel,
> openvswitch and openvswitch-datapath-dkms do you have working perfectly
> in production?
> I'm aware of the potential performance issues with a sub-v1.11 ovs -
> slow performance is a lesser issue for me right now, and we have other
> protections against DOS attacks, I'm more concerned with having a stable
> system that works as it's supposed to.
> Ideally I'd like a combination of packages directly from Ubuntu Archive
> and Cloud Archive - preferably no compilations from source or PPA's. I'm
> happy to use some packages from Havana Cloud Archive if they come
> recommended.
> So far it looks to me like this may work:
> kernel 3.11.0-12 - using linux-lts-saucy from Ubuntu Archive
> openvswitch 1.10.2 - from Havana Cloud Archive
> openvswitch-datapath-dkms 1.10.2 - from Havana Cloud Archive
> Any thoughts, comments or anecdotes would be highly appreciated.
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