[ofa-general] detecting "recv buffer not available" events

[Or Gerlitz]

Ralph Campbell wrote:
> There is no generic counter you can query to find the number
> of RNR retires. The best you can do is set the IBV_QP_RNR_RETRY
> parameter to zero and see if you get any IBV_WC_RNR_RETRY_EXC_ERR
> error completions. 
Applicatively, if you are using the RDMA-CM, what Ralph suggests is to 
set the rnr_retry_count conn param field when calling rdam_connnect/accept

Or.