From: Shahed Shaikh <shshaikh@marvell.com>
Date: Fri, 18 Jan 2019 10:29:30 +0000 (-0800)
Subject: net/qede: remove prefetch in Tx path
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=d6ddd17fb17cb250044bada4ae42a799375fd6c5;p=dpdk.git

net/qede: remove prefetch in Tx path

Incorrect placement of prefetch in Tx path is causing
a performance drop of around ~2% on AMD platform.

Fixes: 2ea6f76aff40 ("qede: add core driver")
Cc: stable@dpdk.org

Signed-off-by: Shahed Shaikh <shshaikh@marvell.com>
Acked-by: Rasesh Mody <rmody@marvell.com>
---

diff --git a/drivers/net/qede/qede_rxtx.c b/drivers/net/qede/qede_rxtx.c
index 684c4aeefc..eda19b2b17 100644
--- a/drivers/net/qede/qede_rxtx.c
+++ b/drivers/net/qede/qede_rxtx.c
@@ -2181,7 +2181,6 @@ qede_xmit_pkts(void *p_txq, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 
 		txq->nb_tx_avail -= bd1->data.nbds;
 		txq->sw_tx_prod++;
-		rte_prefetch0(txq->sw_tx_ring[TX_PROD(txq)].mbuf);
 		bd_prod =
 		    rte_cpu_to_le_16(ecore_chain_get_prod_idx(&txq->tx_pbl));
 #ifdef RTE_LIBRTE_QEDE_DEBUG_TX