On Thu, Nov 06, 2008 at 04:40:21PM -0600, Anthony Liguori wrote: > We've been talking about avoiding hardware passthrough entirely and > just backing a virtio-net backend driver by a dedicated VF in the > host. That avoids a huge amount of guest-facing complexity, let's > migration Just Work, and should give the same level of performance. I don't believe that it will, and every benchmark I've seen or have done so far shows a significant performance gap between virtio and direct assignment, even on 1G ethernet. I am willing however to reserve judgement until someone implements your suggestion and actually measures it, preferably on 10G ethernet. No doubt device assignment---and SR-IOV in particular---are complex, but I hardly think ignoring it as you seem to propose is the right approach. Cheers, Muli -- The First Workshop on I/O Virtualization (WIOV '08) Dec 2008, San Diego, CA, http://www.usenix.org/wiov08/ <-> SYSTOR 2009---The Israeli Experimental Systems Conference http://www.haifa.il.ibm.com/conferences/systor2009/ -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
