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In order to learn libvirt multiqueue several things must be done: 1) The '/dev/net/tun' device needs to be opened multiple times with IFF_MULTI_QUEUE flag passed to ioctl(fd, TUNSETIFF, &ifr); 2) Similarly, '/dev/vhost-net' must be opened as many times as in 1) in order to keep 1:1 ratio recommended by qemu and kernel folks. 3) The command line construction code needs to switch from 'fd=X' to 'fds=X:Y:...:Z' and from 'vhostfd=X' to 'vhostfds=X:Y:...:Z'. 4) The monitor handling code needs to learn to pass multiple FDs.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>