On Jul 15, 2008, at 6:11 AM, Hubert Ritzdorf wrote:

Freeing user buffers which are still in use by an interconnect is another topic. What's about the receive buffer ? The receive buffer could also already be freed or re-used in another way directly after the receive was finished.

That should be fine.

Does the retransmit to the receive buffer not cause corresponding problems ?

I would think that the hardware should recognize it as a duplicate message and drop it (therefore not causing a problem with the receive buffer). After all, in my example, only the receiver's ACK was lost -- the message was otherwise already successfully received.

I think that the receive cannot return before the transfer is finished and the user buffers can be reused.

Agreed. -- Jeff Squyres Cisco Systems