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[net-next,04/16] i40e/i40evf: improve Tx performance with a small tweak

Message ID 1436778517-16254-5-git-send-email-jeffrey.t.kirsher@intel.com
State Changes Requested, archived
Delegated to: David Miller
Headers show

Commit Message

Kirsher, Jeffrey T July 13, 2015, 9:08 a.m. UTC 
From: Jesse Brandeburg <jesse.brandeburg@intel.com>

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 <jesse.brandeburg@intel.com>
Tested-by: Jim Young <james.m.young@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
 drivers/net/ethernet/intel/i40e/i40e_txrx.c   | 2 ++
 drivers/net/ethernet/intel/i40evf/i40e_txrx.c | 2 ++
 2 files changed, 4 insertions(+)
diff mbox

Patch

diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index 9a4f2bc..1fe230d 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -2616,6 +2616,8 @@  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 395f32f..0f0e185 100644
--- a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
@@ -1841,6 +1841,8 @@  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;