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RoCE is a standard for RDMA over Ethernet that is also defined and specified by the IBTA orga- nization. RoCE provides true RDMA semantics for Ethernet as it does not require the complex and low performance TCP transport (needed for iWARP, for example).
RoCE is the most efficient low latency Ethernet solution today. It requires a very low CPU over- head and takes advantage of Priority Flow Control in Data Center Bridging Ethernet for lossless connectivity. RoCE has been fully supported by the Open Fabrics Software since the release of OFED 1.5.1.