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Description of problem:
As subject.

Version-Release number of selected component (if applicable):
libvirt-0.8.7-7.el6.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Edit guest xml and add the following <driver> element.

   <interface type='...'>
       ...
       <model type='virtio'/>
       <driver name='qemu|vhost' txmode='timer|iothread'/>
       ...
   </interface>

  
Actual results:
Unable to set successfully.

Expected results:
The networking still works

Additional info:

Actually it can't be specified with 'txmode' attribute on <driver> element.

<driver txmode='timer'/>

<driver txmode='iothread'/>

The corresponding RFE which requested this support is only in POST now, it will be included in the next libvirt package. Closing this as a dup of that RFE.

*** This bug has been marked as a duplicate of bug 629662 ***