We are using S2D with IB on ConnectX 3 cards. No problems.
I am not familiar with the Test-RDMA script.
How are you testing RDMA? I use Windows Performance Monitor. There are RDMA specific counters which make it easy to track RDMA traffic. Other than setup and drivers there was not much else to do.
Have you installed the latest drivers for you cards?
Before the tests that involve I/O system, did you verify that
* TCP/IP connectivity works ( ping?)
* nd_write_bw/nd_read_bw tests are working?
* are you able to run nd_XXXX tests on the same machine? Use two shell windows to run sever in one and client in another?
* what is the failure you are getting when RDMA test fails?