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[net-next,13/15] i40e/i40evf: enable prefetch of Tx descriptors during cleanup

Message ID 1425740603-11280-14-git-send-email-jeffrey.t.kirsher@intel.com
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Kirsher, Jeffrey T March 7, 2015, 3:03 p.m. UTC 
From: Jesse Brandeburg <jesse.brandeburg@intel.com>

Performance can be improved a bit by imitating ixgbe and using
prefetch to get us the next Tx descriptor.

Change-ID: Ice7ffd4cd0ce87c35295059bdb7972a7f53723aa
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@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 a60b840..f5a50b9 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -770,6 +770,8 @@  static bool i40e_clean_tx_irq(struct i40e_ring *tx_ring, int budget)
 			tx_desc = I40E_TX_DESC(tx_ring, 0);
 		}
 
+		prefetch(tx_desc);
+
 		/* update budget accounting */
 		budget--;
 	} while (likely(budget));
diff --git a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
index 1c2637b..d9f3db5 100644
--- a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
@@ -289,6 +289,8 @@  static bool i40e_clean_tx_irq(struct i40e_ring *tx_ring, int budget)
 			tx_desc = I40E_TX_DESC(tx_ring, 0);
 		}
 
+		prefetch(tx_desc);
+
 		/* update budget accounting */
 		budget--;
 	} while (likely(budget));