Numa

Links

• NUMA and vCPU pinning
• Checking for NUMA capabilities
• Numa policy hit/miss statistics
• Proxmox CPU affinity for VMs with nice diagram
• libvirt NUMA Tuning
• Basic VM tuning guide for multi socket motherboards
• https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/6/html/performance_tuning_guide/main-cpu
• https://forum.proxmox.com/threads/dual-socket-systems.158898/

Tools

lscpu

NUMA:
 NUMA node(s):           2
 NUMA node0 CPU(s):      0-7,16-23
 NUMA node1 CPU(s):      8-15,24-31

Where node0 has physical cores 0-7 and 16-23 are virtual/SMT

numatop

Error messages

CPU is not supported!

Doesn't work in VM? Or just doesn't know the CPU?

numastat

• Numa policy hit/miss statistics

On host

Also try per guest, get PID of guest and

numastat <PID>

Numatune

Is run on the host

lstopo

• https://www.thomas-krenn.com/en/wiki/Display_Linux_CPU_topology_with_lstopo

Try

lstopo --of txt

Output

PU

Package Unit. Usually core + optional SMT