High performance computing center roce overview

Catalog

RoCE

RDMA As early as Infiniband Transmission network , Advanced technology , But the price is high , Later, manufacturers in the industry put RDMA Migration to Ethernet On , To reduce the RDMA The cost of using , To promote the RDMA Technology popularization . stay Ethernet On , According to the difference of protocol stack convergence , It is divided into iWARP and RoCE Two kinds of technology .

stay 2010 Published in RoCE（Remote Direct Memory Access over Converged Ethernet,RDMA over Converged Ethernet, Remote memory direct access protocol based on Ethernet fusion ） Is an Ethernet connection RDMA Transmission network protocol , It makes it possible to operate on a standard Ethernet infrastructure （ Switch ） Upper use RDMA.

RoCE The agreement has RoCEv1 and RoCEv2 Two versions , It depends on the network adapter used / Card type .

1. RoCEv1： It is based on the Ethernet link layer RDMA agreement , On the Ethernet layer typeID yes 0x8915.RoCEv1 Switches in the network need to support PFC/DCB Wait for flow control technology , Network card support is required RoCEv1 agreement , In order to ensure the physical layer