Programmatically detecting CPU affinity of PCI card for sandybridge

Programmatically detecting CPU affinity of PCI card for sandybridge

Folks,

With Sandybrdige, a PCI card has a natural affinity to one CPU. How can I programmatically determine which CPU it is, so that I can affinitize my program to the right CPU?

Many thanks!

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Hi,

in Linux you can identify which processor your PCIe device is connected to by reading the "/sys/devices/[PCI root]/[PCIe function]/numa_node" or "/sys/class/[device class]/[interface]/device/numa_node" virtual files. However BIOS should support the proper ACPI feature for such detection, otherwise numa_node will report -1.

Best regards,
Roman

in Linux you can look it up in the /sys/devices/[PCI root]/[PCIe function]/numa_node virtual file. However BIOS should support
the proper ACPI feature, otherwise you will read -1.

for network card devices it is also available through "/sys/class/net/[interface]/device/numa_node" file.

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