[libvirt] Re: Supporting vhost-net and macvtap in libvirt for QEMU

On Thursday 17 December 2009, Daniel P. Berrange wrote: > On Wed, Dec 16, 2009 at 07:48:08PM -0600, Anthony Liguori wrote: > > >> The more interesting invocation of vhost-net though is one where the >> vhost-net device backs directly to a physical network card. In this >> mode, vhost should get considerably better performance than the current >> implementation. I don't know the syntax yet, but I think it's >> reasonable to assume that it will look something like -net >> tap,dev=eth0. The effect will be that eth0 is dedicated to the guest. >> > Ok, so in this model you have to create a dedicated ethXX device for > every guest, no sharing ? > I think so, but it could be any of * a physical NIC dedicated to the guest, e.g. if you want to run a firewall on that guest and provide connectivity to all other guests to that, or if you have lots of real NICs * an IOV adapter with separate physical or virtual functions * a VMDq adapter that shows multiple queues on the same PCI function as separate network interfaces * a macvlan device in VEPA or bridge mode