CPU Affinity After Live Migration of Virtual Machine on NUMA Systems (Doc ID 2225684.1)

Last updated on FEBRUARY 12, 2017

Applies to:

Oracle VM - Version 3.2.1 to 3.4.2 [Release OVM32 to OVM34]
Linux x86-64

Symptoms

By default, a VM guest starts up with vCPUs limited in one NUMA node.

After a live migration of a virtual machine between two servers with NUMA architecture, the CPU affinity is set to "any CPU" over all NUMA nodes.

As a result, the migrated virtual machine uses memory across multiple nodes, which degrades performance of the virtual machine.

Cause

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