Now that the dynamic master discovery is working, re-enable IB with proper configuration for better throughput: - NCCL_IB_DISABLE=0 (enable IB) - Regex patterns for IB interfaces (vary by node: ibp6s0, ibp7s0) - RoCE v2 configuration (GID_INDEX=3) - GPUDirect RDMA enabled (NET_GDR_LEVEL=5) Co-Authored-By: Claude <noreply@anthropic.com>