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David Johnson authored
Mostly this is about disabling SMT in the root VM on the compute nodes, so it can then be used by kvm-accelerated VMs (see http://www.redbooks.ibm.com/redbooks/pdfs/sg248231.pdf). But we also add SMT-aware nova flavors (e.g., as described in https://docs.openstack.org/nova/pike/admin/cpu-topologies.html) so that users can use individual threads instead of consuming whole cores.
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