[dpdk-dev] [PATCH 6/8 v2] change the postion of data prefetch for splitter packets

[Zhe Tao]

according to ixgbe vector implementation, change the data prefetch position

Signed-off-by: Zhe Tao <zhe.tao at intel.com>
---
 drivers/net/i40e/i40e_rxtx_vec.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/net/i40e/i40e_rxtx_vec.c b/drivers/net/i40e/i40e_rxtx_vec.c
index 6f89002..f5b2db6 100644
--- a/drivers/net/i40e/i40e_rxtx_vec.c
+++ b/drivers/net/i40e/i40e_rxtx_vec.c
@@ -314,13 +314,6 @@ _recv_raw_pkts_vec(struct i40e_rx_queue *rxq, struct rte_mbuf **rx_pkts,
 		__m128i zero, staterr, sterr_tmp1, sterr_tmp2;
 		__m128i mbp1, mbp2; /* two mbuf pointer in one XMM reg. */
 
-		if (split_packet) {
-			rte_prefetch0(&rx_pkts[pos]->cacheline1);
-			rte_prefetch0(&rx_pkts[pos + 1]->cacheline1);
-			rte_prefetch0(&rx_pkts[pos + 2]->cacheline1);
-			rte_prefetch0(&rx_pkts[pos + 3]->cacheline1);
-		}
-
 		/* B.1 load 1 mbuf point */
 		mbp1 = _mm_loadu_si128((__m128i *)&sw_ring[pos]);
 		/* Read desc statuses backwards to avoid race condition */
@@ -341,6 +334,13 @@ _recv_raw_pkts_vec(struct i40e_rx_queue *rxq, struct rte_mbuf **rx_pkts,
 		/* B.2 copy 2 mbuf point into rx_pkts  */
 		_mm_storeu_si128((__m128i *)&rx_pkts[pos+2], mbp2);
 
+		if (split_packet) {
+			rte_prefetch0(&rx_pkts[pos]->cacheline1);
+			rte_prefetch0(&rx_pkts[pos + 1]->cacheline1);
+			rte_prefetch0(&rx_pkts[pos + 2]->cacheline1);
+			rte_prefetch0(&rx_pkts[pos + 3]->cacheline1);
+		}
+
 		/*shift the pktlen field*/
 		desc_pktlen_align(descs);
 
-- 
1.9.3