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[v2.0.x] prov/efa: Skip rx pkt refill under certain threshold
Libfabric currently refill the rx pkt pool in every cq read when there are >0 pkts to post, which makes it have chance to post ibv_recv 1-by-1 if there is only 1 pkt to post per cq read. Such 1-by-1 post is less performant than having a batch post once. This patch improves this strategy by introducing a threshold for the refilling. When When the number of internal rx pkts to post is lower than this threshold, the refill will be skipped. Also introduced FI_EFA_INTERNAL_RX_REFILL_THRESHOLD that allows tuning this parameter. Signed-off-by: Shi Jin <[email protected]> (cherry picked from commit a149f51)
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