7.45 CPU Affinity After Live Migration of Virtual Machine on Non-Uniform Memory Access (NUMA) Systems

After a live migration of a virtual machine between two servers with NUMA architecture, the CPU affinity is set to "any CPU". As a result, the migrated virtual machine uses memory across multiple nodes, which degrades performance of the virtual machine.

Workaround: Before performing the live migration of virtual machines, configure CPU pinning in the guest vm.cfg file. For example, to pin a virtual machine with 4 VCPUs to physical CPUs 4, 5, 6, and 7, add the following line to the vm.cfg:

cpu = "4-7"

Bug 22382809