9db651c75a45587374f7c66c48b61feee9060dc8
Flags GPUs that reach one or more peers only via a SYS-class PCIe hop (crossing the CPU/NUMA-node boundary) in nvidia-smi topo -m. On servers where GPUs are only bridged pairwise via NVLink bridge (no switched NVLink fabric), this is the exact path that traffic between different bridge pairs has to cross, and can cut multi-GPU throughput by 2x+ for workloads spanning more than one pair. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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