Numa

Links

• NUMA and vCPU pinning
• KVM tuning
• 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?

Fail to setup perf (probably permission denied)!

Seems you need to run it was root, with a high ulimit -n

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

Package: hwloc Try

lstopo --of txt

Output

PU

Package Unit. Usually core + optional SMT