RoCE · RDMA over Converged Ethernet
RDMA over Ethernet. ECN signals congestion; it does not make the fabric lossless. The design must state queueing and congestion control plus any PFC, retransmission/recovery, routing, buffering, and failure-handling choices.
Also written as: RoCEv2 · RoCEv1
Current numbers
51.2 TbpsJericho4 deep-buffer router, 3 nm, HBM packet buffer (size unpublished); RoCE over >100 km via 3.2 Tbps HyperPorts (Broadcom claim)
400Gspeed of Meta's 2024 production RoCE back-end: PFC only, no DCQCN, receiver-driven admission in the collective library