Tom might be correct, I checked my system. Using rpm -qa, I did not find Xen, but found libvirt.

At 2012-09-25 21:38:23,"Tom Bryan (tombry)" <tombry@cisco.com> wrote:

>On 9/25/12 9:10 AM, "Jeff Squyres (jsquyres)" <jsquyres@cisco.com> wrote:
>
>>>problem, so i fixed it using "--mca btl_tcp_if_include bond0" because I
>>>know this is the high speed network interface I should use on each node.
>>
>>Glad it works for you!
>>
>>If you're not using those interfaces (they might be related to Xen, or
>>something like that?), you might want to disable them.
>
>YMMV, but on our RHEL machines, I believe that the virbr0 interface is
>coming from the libvirt package.
>
>---Tom
>
>
>
>_______________________________________________
>users mailing list
>users@open-mpi.org
>http://www.open-mpi.org/mailman/listinfo.cgi/users