RE: [Question/Bug?] Why does the sysfs current_link_speed report a different value than pp_dpm_pcie

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From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of Maxime Schmitt
Sent: Wednesday, April 6, 2022 1:40 AM
To: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Subject: [Question/Bug?] Why does the sysfs current_link_speed report a different value than pp_dpm_pcie

 

Hello,

 

On my system the sysfs file "current_link_speed" is reporting "16.0 GT/s PCIe".

The GPU has support for PCIe gen 4 (AMD Radeon RX 6800 XT).

However neither the CPU (AMD Ryzen 7 1700X) nor the motherboard have support for PCIe gen 4.

 

The file "pp_dpm_pcie" returns the following:

0: 2.5GT/s, x1 310Mhz
1: 8.0GT/s, x16 619Mhz *

Which is correct.

 

Is this the expected behavior?

[Quan, Evan] “pp_dpm_pcie” is reporting the correct link speed. You can trust that.

While “current_link_speed” seems reporting the link speed the card is capable of. Not sure whether that fits design.

@Deucher, Alexander Any comments for the output of sysfs file “current_link_speed”?

 

BR

Evan

 

I am asking because I recently added AMDGPU support to a monitoring tool I maintain (nvtop) and I don't know where to get the information from.

 

Cheers,

Maxime

 


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