> > when RDMA is used, a message is transferred from card A (in node > > A) to card B (in node B), card B delivers the message to > to user buffer, > and sends ACK to card A, but ACK is lost > due to switch fail. So process > on node A get fail for this > transfer, but process on node B check the > memory and get > the message(success). > > > > If send/recv(SRQ) is used, is it possible that process on node A > > get failure, but process on node B successfully get the message ? > > Yes, of course, for exactly the same reason you describe > above (lost ACK).
Thanks. So it is NOT possible that sender gets success, but receiver gets failure, right ? Also another question, when it_post_send() is called, we only specify IBV_SEND_SIGNALED once a while to improve performance because completion event is not generated for other messages. But when there is an error on the QP connection, we hope to get event report for all messages. Does the driver/libibverbs support this ? --CQ > > - R. > _______________________________________________ openib-general mailing list openib-general@openib.org http://openib.org/mailman/listinfo/openib-general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
