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In certain fabric configurations, InfiniBand packets for a given QP may take up different paths in a network from source to destination. This results into packets being received in an out-of-order manner. These packets can now be handled instead of being dropped, in order to avoid retransmission. Data will be placed into host memory in an out-of-order manner when out of order messages are received.
OOO feature is enabled by default in RDMA-Core.