Breadcrumbs

nvidia-smi does not make use of NVLink even though the NVSwitches are shown as connected devices

  • Issue: Running lspci grep | NVIDIA contains NVSwitches in the output but verifying it via nvidia-smi topo -m doesn’t show them. Most probably, the installation of NVIDIA Fabric Manager is missing.

  • Workaround:

    • Install the correct version of NVIDIA Fabric Manager. It is identical with the one you are using for NVIDIA drivers:
      sudo apt-get update
      sudo apt-get -y install cuda-drivers-fabricmanager-<DRIVER_VERSION_NUMBER>
      sudo systemctl enable nvidia-fabricmanager

    • Running nvidia-smi topo -m should now display NVLink support.