why /sys/class/net/eth0/device/numa_node shows -1

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Hi experts,
I met an issue regarding NUMA, I have a physical server with a PCIE Network Interface Card, the os is RHEL 7.5. Why the value of /sys/class/net/eth0/device/numa_node is “-1”?


This means the PCIe bus has no NUMA locality.

The cost to go from the PCIe bus to any individual node should be the same.

So handle all this device's IRQs on real cores within the same node as each other, but it should not matter which node.

Understood, thanks so much.