Retrieving NUMA node ID

[sukyoungjeong-furiosa]

It would be useful if we can retrieve NUMA node ID associated with the NPU device's PCI lane.

cf)

Currently, one can retrieve NUMA node ID as follows:

root@sukyoungjeong-npu-0:~# cat /sys/class/npu_mgmt/npu5_mgmt/busname
0000:ce:00.0
root@sukyoungjeong-npu-0:~# cat /sys/bus/pci/devices/0000\:ce\:00.0/numa_node
1

[libc-furiosa]

관련하여 도움이 될만한 문서 몇 가지를 남깁니다. 다른 좋은 레퍼런스를 아는게 있으시다면 추가로 공유해주시면 좋을 것 같습니다.

• https://docs.kernel.org/vm/numa.html
• https://support.mellanox.com/s/article/understanding-numa-node-for-performance-benchmarks
• https://kubernetes.io/docs/concepts/extend-kubernetes/compute-storage-net/device-plugins/#device-plugin-integration-with-the-topology-manager

[sukyoungjeong-furiosa]

https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-bus-pci

What: /sys/bus/pci/devices/.../numa_node Date: Oct 2014 Contact: Prarit Bhargava prarit@redhat.com Description: This file contains the NUMA node to which the PCI device is attached, or -1 if the node is unknown. The initial value comes from an ACPI _PXM method or a similar firmware source. If that is missing or incorrect, this file can be written to override the node. In that case, please report a firmware bug to the system vendor. Writing to this file taints the kernel with TAINT_FIRMWARE_WORKAROUND, which reduces the supportability of your system.