On that subject, it's worth knowing that with the default BIOS settings the whole socket shows up as a single NUMA node, which means that most workloads don't b

On that subject, it's worth knowing that with the default BIOS settings the whole socket shows up as a single NUMA node, which means that most workloads don't benefit from automatic NUMA balancing or manual NUMA-aware placement within a socket. One needs to set NPS "Nodes per socket" to e.g. 4 to have one NUMA node per quadrant, and potentially also "L3 cache as NUMA" to have one per CCX [0]. [0] https://www.amd.com/content/dam/amd/en/documents/epyc-technical-docs/tuning-guides/58002_amd-epyc-9004-tg-hpc.pdf https://www.amd.com/content/dam/amd/en/documents/epyc-techni...