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i40e/i40evf: improve Tx performance with a small tweak 

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>
This commit is contained in:
Jesse Brandeburg 2015-04-27 14:57:08 -04:00 committed by Jeff Kirsher
parent c78b953e0f
commit 489ce7a463
2 changed files with 4 additions and 0 deletions
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2
drivers/net/ethernet/intel/i40e/i40e_txrx.c
View File

@ -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;

2
drivers/net/ethernet/intel/i40evf/i40e_txrx.c
View File

@ -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;