NCCL bandwidth capped at 3 GB/s, GPU PCIe topology reports Gen1 x1 on DGX Spark FE

Accelerated Computing DGX Spark / GB10 User Forum DGX Spark / GB10
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  1. They published playbook is designed for one port connected. You can run with both ports with different configuration and you should get similar speed.
  2. Running ethtool -i enp1s0f1np1 should show
driver: mlx5_core
version: 6.17.0-1014-nvidia
firmware-version: 28.45.4028 (NVD0000000087)

Please confirm you have this firmware version to eliminate the FW regression bug.

I will review your logs too