> If this is the case, how would we fix the problem ? It's hard for us to
 > delay to destroy the QP, because we don't know how long to delay.
 > The other way is to do something from the driver, or firmware.

I think you just have to deal with this possibility at your level.
This type of thing is just inherent in network programming: without an
explicit message back, you don't know if any given message has really
been received.  The exact same thing could happen with TCP for
example: just cut the cable after a message has been received but
before the ACK has gone back the other way.

 - R.
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