From 9faec96161388252c6d660dbe262036f2b5c4567 Mon Sep 17 00:00:00 2001 From: Jesse Brandeburg Date: Mon, 27 Apr 2015 14:57:08 -0400 Subject: [PATCH] i40e/i40evf: improve Tx performance with a small tweak Orabug: 21570582 Add a prefetch for the next Tx descriptor to be used when we know there are more coming. Change-ID: Ibb9acab11d508eec2db7da795df74debc16eeacb Signed-off-by: Jesse Brandeburg Tested-by: Jim Young Signed-off-by: Jeff Kirsher (cherry picked from commit 489ce7a46306052ab4ef26c6305051c5f1b24bb4) Signed-off-by: Brian Maly Signed-off-by: Santosh Shilimkar --- drivers/net/ethernet/intel/i40e/i40e_txrx.c | 2 ++ drivers/net/ethernet/intel/i40evf/i40e_txrx.c | 2 ++ 2 files changed, 4 insertions(+) diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c index a8a8232e363ec..7e018fbf5ff83 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c @@ -2618,6 +2618,8 @@ static inline void i40e_tx_map(struct i40e_ring *tx_ring, struct sk_buff *skb, netif_xmit_stopped(netdev_get_tx_queue(tx_ring->netdev, tx_ring->queue_index))) writel(i, tx_ring->tail); + else + prefetchw(tx_desc + 1); return; diff --git a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c index 690e67ee9fbff..35a647fa6ffba 100644 --- a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c +++ b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c @@ -1843,6 +1843,8 @@ static inline void i40evf_tx_map(struct i40e_ring *tx_ring, struct sk_buff *skb, netif_xmit_stopped(netdev_get_tx_queue(tx_ring->netdev, tx_ring->queue_index))) writel(i, tx_ring->tail); + else + prefetchw(tx_desc + 1); return; -- 2.50.1