On Mon, May 31, 2010 at 7:44 AM, Amos Kong <kongjianjun@xxxxxxxxx> wrote: > Hello all, > > Can I ask some question of the offloading function with Virtio-NIC? > > I'm interested in KVM virtualization. The virtual NIC is different > from real hardward. And there is also a big distance between > Virtio-NIC and E1000-NIC. > The offloading function of Virtio-NIC close related with the function > of host's real hardware. > Associate Feature bits: > VIRTIO_NET_F_GUEST_... > VIRTIO_NET_F_HOST_... > > --------------------------------------------------- > command: > enable rx: guest) # ethtool -K eth0 > enable tx: guest) # ethtool -K eth0 > enable gs: guest) # ethtool -K eth0 > enable tso: guest) # ethtool -K eth0 > enable gso: guest) # ethtool -K eth0 > enable lro: guest) # ethtool -K eth0 > enable gro: guest) # ethtool -K eth0 sorry , it should be enable rx: guest) # ethtool -K eth0 rx on enable tx: guest) # ethtool -K eth0 tx on enable gs: guest) # ethtool -K eth0 gs on enable tso: guest) # ethtool -K eth0 tso on enable gso: guest) # ethtool -K eth0 gso on enable lro: guest) # ethtool -K eth0 lro on enable gro: guest) # ethtool -K eth0 gro on It also works with my real hardware. > Those steps work well with Virtual E1000-NIC, but it always fail when > using Virtio-NIC. > > --------------------------------------------------- > After setup, I have two check method. For example: > 1. enable tso > 2. check the output of 'ethtool -k eth0' > 3. send large file from guest to host by scp, listen by tcpdump during > transferring file. and check if there contains some large > packet($length > 1514). > > The check method works with Virtual E1000-NIC, but it always fail when > using Virtio-NIC. > > --------------------------------------------------- > My question: > 1. How to setup offloading function of Virtio-NIC? > 2. How about my check method of offloading function(transferring file, > check packet length by tcpdump)? > 3. Is there some detail user guide for Virtio-NIC? > > > > Best Regards, > Amos > -- 个人主页搬家了，欢迎来串门 ;) http://kongove.whostas.com/ -- 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
