RoCE · RDMA over Converged Ethernet
RDMA carried on Ethernet (made lossless via PFC/ECN); the open, cost-driven alternative to InfiniBand for AI fabrics.
Current numbers
51.2 TbpsBroadcom Jericho4 deep-buffer router; 3nm; HBM packet memory (~160× on-chip); RoCE over >100 km via 3.2 Tbps HyperPorts
~95%Spectrum-X / tuned-RoCE effective throughput vs raw link rate under collective load; untuned RoCE can collapse to ~60%
tens of µsNVMe-oF read latency over RDMA (RoCE/IB) vs milliseconds for legacy NFS/iSCSI