On 05/07/2013 11:19 PM, Gao Yongwei wrote: Yes, libvirt is able to take advantage of libnuma calls into numad for determining auto-placement of guest resources on a single node, rather than spread out across multiple NUMA nodes, with the corresponding performance improvements. You can also request specific pinning rather than relying on automatic placement. For more details, here is the portion of the XML that controls how libvirt will interact with numad: http://libvirt.org/formatdomain.html#elementsNUMATuning -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org