numa

The numa hook adds numa support to a VM’s XML definitions. This can help improve a VM placement on the NUMA nodes of a NUMA-enabled host

The libvirt XML will have the following entry added:

<numatune>
    <memory mode="strict" nodeset="1-4,^3"/>
</numatune>

Syntax:

numa=<memory policy>:<numaset>

Where memory policy can be

• interleave
• strict
• preferred

And the numa set will look like this:

• numaset="1" (use one NUMA node)
• numaset="1-4" (use 1-4 NUMA nodes)
• numaset="^3" (don’t use NUMA node 3)
• numaset="1-4,^3,6" (or combinations)

Examples:

  numa=strict:1-4
  numa=strict:5
  numa=interleave:1-4,^3,6