dcgm diagnostic tests pass despite nvlinks being down

[aditigaur4]

Hello,

I have a machine where all nvlinks are down:

dcgmi nvlink --link-status
+----------------------+
|  NvLink Link Status  |
+----------------------+
GPUs:
    gpuId 0:
        D D D D D D D D D D D D D D D D D D
    gpuId 1:
        D D D D D D D D D D D D D D D D D D
NvSwitches:
    No NvSwitches found.

Key: Up=U, Down=D, Disabled=X, Not Supported=_

Yet when i run dcgmi diagnostics tests at level 2, they all pass, shouldnt they fail if the nvlinks aren't working? the dcgmi docs say that the PCIE tests tests both PCIe and nvlink?

dcgmi diag -r 2
Successfully ran diagnostic for group.
+---------------------------+------------------------------------------------+
| Diagnostic                | Result                                         |
+===========================+================================================+
|-----  Metadata  ----------+------------------------------------------------|
| DCGM Version              | 3.3.7                                          |
| Driver Version Detected   | 560.35.03                                      |
| GPU Device IDs Detected   | 2321,2321                                      |
|-----  Deployment  --------+------------------------------------------------|
| Denylist                  | Pass                                           |
| NVML Library              | Pass                                           |
| CUDA Main Library         | Pass                                           |
| Permissions and OS Blocks | Pass                                           |
| Persistence Mode          | Pass                                           |
| Info                      | Persistence mode for GPU 0 is disabled. Enabl  |
|                           | e persistence mode by running "nvidia-smi -i   |
|                           | <gpuId> -pm 1 " as root.,Persistence mode for  |
|                           |  GPU 1 is disabled. Enable persistence mode b  |
|                           | y running "nvidia-smi -i <gpuId> -pm 1 " as r  |
|                           | oot.                                           |
| Environment Variables     | Pass                                           |
| Page Retirement/Row Remap | Pass                                           |
| Graphics Processes        | Pass                                           |
| Inforom                   | Pass                                           |
+-----  Integration  -------+------------------------------------------------+
| PCIe                      | Pass - All                                     |
+-----  Hardware  ----------+------------------------------------------------+
| GPU Memory                | Pass - All                                     |
+-----  Stress  ------------+------------------------------------------------+
+---------------------------+------------------------------------------------+