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vCPUs are calculated based on what is reported in /proc/cpuinfo. You have hyperthreading enabled, thus you have X physical CPUs * Y cores * 2.

From what I've read, enabling hyperthreading is recommended on compute nodes, so your numbers seem fine.

vCPUs are calculated based on what is reported in /proc/cpuinfo. You have hyperthreading enabled, thus you have X physical CPUs * Y cores * 2.

From what I've read, enabling hyperthreading is recommended on compute nodes, so your numbers seem fine.

This presentation explains a bit about overbooking:

http://www.slideshare.net/stackops/stackops-openstack-nova-sizing-service-definition

Also look at the "cpu_allocation_ration" option in nova.conf:

http://docs.openstack.org/trunk/openstack-compute/admin/content/corefilter.html