[ovs-discuss] Can not change MTU of emulated ports (ethxxxx-emu)

Jamshaid Faisal j.faisal at gmail.com
Wed Mar 28 17:47:57 UTC 2018

Few more findings...

If i switch nic model from default  rtl8139 to e1000 in XEN DomU config,
then resulted emulated interface can successfully set MTU 9000.

However Xen stubdomain device model dont let to set MT > 1500 no matter it
is rtl8139  or e1000

It dont really seems openvswitch issue.

On Wed, Mar 28, 2018 at 9:52 PM, Jamshaid Faisal <j.faisal at gmail.com> wrote:

> Hello
> I need to change MTU of OVS bridge to 9000. And this is only possible if
> all ports of OVS are mtu 9000.
> I am using XEN (xl toolstack) which is creating  emulated interface in OVS
> for each port it create. for example each port is added in ovs as two ports
> ethxxxxx
> ethxxxxx-emu
> i can set the mtu for ethxxxxx but if i try to set mtu > 1500 for emulated
> interface ethxxxx-emu, i get the error
> SIOCSIFMTU: Invalid argument
> So it seems those emulated ports dont support MTU greater then 1500. In
> this case how can i switch MTU of bridge to 9000 ?
> Thanks for any help you can provide.
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