> > > Is it possible to transfer a large file, say 25GB, between two computers using > > > RDMA UD, and have an exact copy of the original file on the receiving side? My > > > understanding is that the order of the messages is not guaranteed with UD. > > > But I thought that if I only use one QP I could ensure that the ordering of the > > > data will be predictable. > > > > It is not guaranteed to be in order. > > > > Why would you do this anyhow? The overhead to use RC is pretty small > > > So even if I am using only 1 QP, it is still not guaranteed to be in > order. Ok. Thanks. The spec doesn't guarantee ordering, though I doubt messages would ever be unordered in practice. You could transfer a sequence number as immediate data to allow the receiver to verify (and correct) packet ordering, and detect lost packets. - Sean
