On 04/25/11 13:29, Alex Williamson wrote: > So we're effectively getting host-host latency/throughput for the VF, > it's just that in the 82576 implementation of SR-IOV, the VF takes a > latency hit that puts it pretty close to virtio. Unfortunate. I think For host-to-VM using VFs is worse than virtio which is counterintuitive. > you'll find that passing the PF to the guests should be pretty close to > that 185us latency. I would assume (hope) the higher end NICs reduce About that 185usec: do you know where the bottleneck is? It seems as if the packet is held in some queue waiting for an event/timeout before it is transmitted. David > this, but it seems to be a hardware limitation, so it's hard to predict. > Thanks, > > Alex > -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
