Anthony Liguori <anthony@xxxxxxxxxxxxx> writes: > > What we would rather do in KVM, is have the VFs appear in the host as > standard network devices. We would then like to back our existing PV > driver to this VF directly bypassing the host networking stack. A key > feature here is being able to fill the VF's receive queue with guest > memory instead of host kernel memory so that you can get zero-copy > receive traffic. This will perform just as well as doing passthrough > (at least) and avoid all that ugliness of dealing with SR-IOV in the > guest. But you shift a lot of ugliness into the host network stack again. Not sure that is a good trade off. Also it would always require context switches and I believe one of the reasons for the PV/VF model is very low latency IO and having heavyweight switches to the host and back would be against that. -Andi -- ak@xxxxxxxxxxxxxxx -- 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
