One Cable, 200 Gbit/s: Connecting Two GB10 Systems with ConnectX-7

What looks like a simple Ethernet cable is one of the most interesting parts of a two-node GB10 setup. A single QSFP112 cable can provide a dedicated 200 Gbit/s path for distributed inference, model training, MPI, and NCCL traffic. There is one surprise: Linux exposes the connected physical port as two network interfaces. A normal one-interface configuration leaves half of the host path unused.…