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Commit cd4ccf76 authored by Lennert Buytenhek's avatar Lennert Buytenhek Committed by Lennert Buytenhek
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mv643xx_eth: use longer DMA bursts 



The mv643xx_eth driver is limiting DMA bursts to 32 bytes, while
using the largest burst size (128 bytes) gives a couple percentage
points performance improvement in throughput tests, and the docs
say that the 128 byte default should not need to be changed, so
use 128 byte bursts instead.

Signed-off-by: default avatarLennert Buytenhek <buytenh@marvell.com>
parent ae9ae064

drivers/net/mv643xx_eth.c

+6 −6
Original line number Diff line number Diff line
@@ -129,21 +129,21 @@ static char mv643xx_eth_driver_version[] = "1.1"; 
/*

 * SDMA configuration register.

 */

#define RX_BURST_SIZE_4_64BIT		(2 << 1)

#define RX_BURST_SIZE_16_64BIT		(4 << 1)

#define BLM_RX_NO_SWAP			(1 << 4)

#define BLM_TX_NO_SWAP			(1 << 5)

#define TX_BURST_SIZE_4_64BIT		(2 << 22)

#define TX_BURST_SIZE_16_64BIT		(4 << 22)



#if defined(__BIG_ENDIAN)

#define PORT_SDMA_CONFIG_DEFAULT_VALUE		\

		RX_BURST_SIZE_4_64BIT	|	\

		TX_BURST_SIZE_4_64BIT

		RX_BURST_SIZE_16_64BIT	|	\

		TX_BURST_SIZE_16_64BIT

#elif defined(__LITTLE_ENDIAN)

#define PORT_SDMA_CONFIG_DEFAULT_VALUE		\

		RX_BURST_SIZE_4_64BIT	|	\

		RX_BURST_SIZE_16_64BIT	|	\

		BLM_RX_NO_SWAP		|	\

		BLM_TX_NO_SWAP		|	\

		TX_BURST_SIZE_4_64BIT

		TX_BURST_SIZE_16_64BIT

#else

#error One of __BIG_ENDIAN or __LITTLE_ENDIAN must be defined

#endif