[Openstack] Directional network performance issues with Neutron + OpenvSwitch

Jay Pipes jaypipes at gmail.com
Wed Oct 2 16:28:28 UTC 2013

On 10/02/2013 12:17 PM, James Page wrote:
> Hash: SHA256
> Hi Jay
> On 02/10/13 16:37, Jay Pipes wrote:
>> Hi James, have you tried setting the MTU to a lower number of
>> bytes, instead of a higher-than-1500 setting? Say... 1454 instead
>> of 1546?
>> Curious to see if that resolves the issue. If it does, then
>> perhaps there is a path somewhere that had a <1546 PMTU?
> Do you mean in instances, or on the physical servers?

I mean on the instance vNICs.

> For context I hit this problem prior to tweaking MTU's (defaults of
> 1500 everywhere).

Right, I'm just curious :)


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