[openib-general] Handling SM class (SMInfo vs. other queries)

[Roland Dreier]

    Michael> I think the difficulty with the last one is that (at
    Michael> least for Tavor) process local mad can block, since there
    Michael> is a limited number of outstanding commands. Of course
    Michael> you could always make it non-blocking by dropping the MAD
    Michael> if the command interface is busy ... no idea if this will
    Michael> improve or decease performance, though.

Not sure if I understand what the issue is... if the interface is
asynchronous, if there is not room for another outstanding command,
it seems one can just queue the command until a slot becomes open.

 - Roland