ib_send_bw error at client

Hello,

I have two servers each of which installed the latest Mellanox firmware and the Mellanox OFED 4.1 software stack. I tried the ib_send_bw on two machines, but get the error as it shows in following pictures. I have reinstalled the whole software stack for few times, but the problem still exist. Can someone please help me with this problem? Many thanks.

Hello,

i got some useful information from the older posters " "

The problem was because of multiple network cards installed on one server, when i manually specified the network card, the problem is gone.