The idea is simple, just to pin the guest VM user space and then let host NIC driver has the chance to directly DMA to it. The patches are based on vhost-net backend driver. We add a device which provides proto_ops as sendmsg/recvmsg to vhost-net to send/recv directly to/from the NIC driver. KVM guest who use the vhost-net backend may bind any ethX interface in the host side to get copyless data transfer thru guest virtio-net frontend. We provide multiple submits and asynchronous notifiicaton to vhost-net too. Our goal is to improve the bandwidth and reduce the CPU usage. Exact performance data will be provided later. But for simple test with netperf, we found bindwidth up and CPU % up too, but the bindwidth up ratio is much more than CPU % up ratio. What we have not done yet: To support GRO Performance tuning -- 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
