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On 02/06/2015 06:47 PM, Eren Türkay wrote:
> Hello,
> 
> I was having serious network issues using GRE and I have been
> tracking it for a few weeks. Finally, I solved the issue but it
> needs a proper fix. To summarize, I need a way to set MTU settings
> of br-int and br-tun interfaces, enable MQ support in libvirt, and
> run "ethtool -L eth0 combined N" command in VMs.
> 
> The detailed bug report and the explanation for the issue is here: 
> https://bugs.launchpad.net/neutron/+bug/1419069
> 
> There is a blueprint [0] on MQ support but it wasn't accepted.
> 
> What can we do about this performance problem and a possible fix?
> Most people complain about GRE/VXLAN performance and the solution
> appears to be working. I created a bug report and let the list know
> to work on a better, flexible, and working solution. Please ignore
> the ugly patches as they are just proof of concept.
> 
> Regards, Eren
> 
> [0]
> https://blueprints.launchpad.net/nova/+spec/libvirt-virtio-net-multiqueue
>
> 
I guess the MTU part should be fixed in Kilo as part of:
https://github.com/openstack/neutron-specs/blob/master/specs/kilo/mtu-selection-and-advertisement.rst

/Ihar
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