| Message ID | 1430161042-28494-2-git-send-email-catherine.sullivan@intel.com |
|---|---|
| State | Accepted |
| Delegated to: | Jeff Kirsher |
| Headers | show |
> -----Original Message----- > From: Intel-wired-lan [mailto:intel-wired-lan-bounces@lists.osuosl.org] On > Behalf Of Catherine Sullivan > Sent: Monday, April 27, 2015 11:57 AM > To: intel-wired-lan@lists.osuosl.org > Subject: [Intel-wired-lan] [net-next S5 01/15] i40e/i40evf: improve tx > performance with a small tweak > > 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. > > Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com> > Change-ID: Ibb9acab11d508eec2db7da795df74debc16eeacb > --- > drivers/net/ethernet/intel/i40e/i40e_txrx.c | 2 ++ > drivers/net/ethernet/intel/i40evf/i40e_txrx.c | 2 ++ > 2 files changed, 4 insertions(+) > Tested-by: Jim Young <james.m.young@intel.com>
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c index e1596dc..74022ac 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c @@ -2623,6 +2623,8 @@ 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 11de5a5..e629762 100644 --- a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c +++ b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c @@ -1844,6 +1844,8 @@ 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;