> Is librdmacm version 1.0.12 stable?

Yes - but you are using APIs that are new to this release.  But those calls are wrappers around existing libibverbs calls.
 
> The flag IBV_SEND_INLINE supports buffer size until 64 bytes (cards'
> feature).
> 
> I know that RDMA is a protocol connected with 10 Gigabit/s Ethernet.
> How can I see this trasfer speed? Can you suggest the "path"?
> I attached the starting latency_RDMA.cpp code, which works with
> librdmacm version 1.0.12 with BUF_SIZE < = 64 bytes (thanks to Chien).
> I would like to explore transfer speed in range 1 bytes < BUF_SIZE < 4
> Mbytes.

The use of INLINE allows you to post a send message without the buffer being registered.  As soon as you try to post a send with a buffer larger than what can be supported as inline, the buffer must be registered, and the memory region should be passed into the send command.  Add something like this to both the client and server:

struct ibv_mr *send_mr;

...

send_mr = rdma_reg_msgs(id, send_msg, BUF_SIZE);
// add matching rdma_dereg_mr(send_mr); at end

and change your rdma_post_send calls to:

ret = rdma_post_send(id, NULL, send_msg, BUF_SIZE, send_mr, IBV_SEND_INLINE);

- Sean
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