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On 27/10/14 02:18, Li Tianqing wrote:
> Hello, Right now, we test neutron under havana release. We
> configured network_device_mtu=1450 in neutron.conf, After create
> vm, we found the vm interface's mtu is 1500, the ping, ssh, is ok.
> But if we scp large file between vms then scp display 'stalled'.
> And iperf is also can not completed. If we configured vm's mtu to
> 1450, then iperf, scp all is ok. If we iperf with -M 1300, then the
> iperf is ok too. The vms path mtu discovery is set by default. I do
> not know why the vm whose mtu is 1500 can not send large file.

There is a neutron spec currently in discussion for Kilo to finally
fix MTU issues due to tunneling, that also tries to propagate MTU
inside instances: https://review.openstack.org/#/c/105989/

/Ihar
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