>      I understand that ops.poll_cq is actually ibv_cmd_poll_cq(), right ?

No, not for most devices.  Look at libmthca, etc to see what the poll_cq
method is set to.

 >      Do you mean during ibv_poll_cq() call, there is no system call involved 
 > ?

Right, for most devices poll_cq can be done just by looking at memory in
userspace without involving the kernel at all.
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