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i40e/i40evf: enable prefetch of Tx descriptors during cleanup

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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>
This commit is contained in:
Jesse Brandeburg 2015-02-27 09:15:31 +00:00 committed by Jeff Kirsher
parent d9e894ee8a
commit 016890b994
2 changed files with 4 additions and 0 deletions
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2
drivers/net/ethernet/intel/i40e/i40e_txrx.c
View file

@ -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));

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

@ -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));