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On Mon, Oct 27, 2014 at 4:42 AM, Ihar Hrachyshka <ihrachys at redhat.com> wrote:
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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/
>
This is something which would be quite fantastic to land in Kilo, as
multiple people have been bit by this particular issue.

> /Ihar
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