What are the meanings of the PML names OB1, DR and CM? The paper "An
evaluation of Open MPI's Matching Transport Layer on the Cray XT" says that
they don't have any special meaning, but here (
http://www.open-mpi.org/papers/workshop-2006/wed_01_pt2pt.pdf) I saw that DR
stands for "Data Reliability". It's correct?