PCIe Bandwidth Usage always reports zero about amdgpu_top

[Umio-Yasuno]

Could you attach the results of cat pcie_bw?
pcie_bw is output to AMDGPU sysfs.

[nfp0]

Not sure if this is what you wanted, but executing sudo cat /sys/class/drm/card0/device/pcie_bw outputs:

cat: /sys/class/drm/card0/device/pcie_bw: No data available

[Umio-Yasuno]

Ok, RDNA 1/2 GPU dose not support pcie_bw.

https://lists.freedesktop.org/archives/amd-gfx/2020-May/049649.html

For APUs, pcie_bw is not created. But for RDNA 1/2 GPU, pcie_bw is created as an invalid sysfs file.

The pcie_bw check process needs to be improved.

[nfp0]

Oh I see.
So there is no way to check PCIe bandwidth usage on RDNA 1/2 GPUs?

[Umio-Yasuno]

Oh I see. So there is no way to check PCIe bandwidth usage on RDNA 1/2 GPUs?

Probably, yes.
It seems that PCIe RX/TX performance counters have been removed on RDNA GPUs.

[nfp0]

Got it! If I can help testing anything with my RDNA 2 card in the future, please ping me.