Thank you for posting your question on the Mellanox Community.
Based on the information provided, it shows that the RDMA connection is working else, you will not get any output.
As you are running, Oracle Linux provided MLNX drivers, we recommend to install the MLNX_OFED driver for OL, which you can find through the following link ->http://www.mellanox.com/page/products_dyn?product_family=26&mtag=linux_sw_drivers.
In our lab, we tested with the MLNX_OFED installed as that is what we support. It comes with all the latest 'perftest' utils.
Attached is a screenshot which I took from our lab system, it show 'ib_write_bw' bi-directional for a 50Gb/s link. And as it is bidirectional it will add both results together.
If after installation of our MLNX_OFED driver, you still experiencing issues, please open a Mellanox Support Ticket, by sending an email to firstname.lastname@example.org
Thanks and regards,
~Mellanox Technical Support