[dpdk-dev] [PATCH v2 5/7] net/qede: prefetch hardware consumer

[Balazs Nemeth]

Ensure that, while ecore_chain_get_cons_idx is running, txq->hw_cons_ptr
is prefetched. This shows a slight performance improvement.

Signed-off-by: Balazs Nemeth <bnemeth at redhat.com>
Reviewed-by: Igor Russkikh <irusskikh at marvell.com>
---
 drivers/net/qede/qede_rxtx.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/qede/qede_rxtx.c b/drivers/net/qede/qede_rxtx.c
index f439ee056..4f58abfbf 100644
--- a/drivers/net/qede/qede_rxtx.c
+++ b/drivers/net/qede/qede_rxtx.c
@@ -896,6 +896,7 @@ qede_process_tx_compl(__rte_unused struct ecore_dev *edev,
 	uint16_t first_idx;
 
 	rte_compiler_barrier();
+	rte_prefetch0(txq->hw_cons_ptr);
 	sw_tx_cons = ecore_chain_get_cons_idx(&txq->tx_pbl);
 	hw_bd_cons = rte_le_to_cpu_16(*txq->hw_cons_ptr);
 #ifdef RTE_LIBRTE_QEDE_DEBUG_TX
-- 
2.30.2