>         I use ibv_get_cq_event to wait a completion event. I use
 > ibv_ack_cq_events to acknowledge that event every time. But I find I will
 > get the same event many times.

Is it the same event, or a new event for the same CQ?

 >         I want to delete the entry from cq after processing it. How can I do
 > it?

completion queue entries are removed whenever they are returned by
ibv_poll_cq().  You should never get the same entry twice.

Perhaps if you posted the code that is having the problem, we could
help you debug it.
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