IB didn't invent RDMA, and it's not even the only way to do it today. it's also not amazingly great, since it only solves a small fraction of the cluster-commu

IB didn't invent RDMA, and it's not even the only way to do it today. it's also not amazingly great, since it only solves a small fraction of the cluster-communication problem. (that is, almost no program can rely on magic RDMA getting everything were it needs to be - there will always be at least some corresponding "heavyweight" messaging, since you still needs locks and other synchronization.)