Mastering Proxmox - Third Edition

Enabling NUMA

The non-uniform memory access (NUMA) is not a new approach to handling memory in a multi-CPU environment, although it is a new addition to Proxmox VE. With NUMA, memory can be distributed evenly among CPUs, which increases performance since there is no bottleneck due to all CPUs trying to access the same memory bank. In Proxmox, the NUMA option also enables memory and CPU hot-plugging. Without this option, hot-plugging for CPU and memory will not work at all.

Any node with more than one CPU socket is usually NUMA aware. So enabling NUMA for VMs in this node will benefit VM performance. NUMA will always try to keep the VM in the same CPU package. We can check the NUMA status in the Proxmox cluster using the following command: ...