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vcpu number does not reflect cpu_allocation_ratio option

The default value in /etc/nova/nova.conf of cpu_allocation_ratio is 0.0, and I set it to 4.0. Then I restart all nova service in compute and controller node. But seems it does not have any effects. The total vcpu number in hypervisor-stat does not change. Is there a known issue about this issue?(I use ocata version of openstack)