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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: Lennert Buytenhek <buytenh@marvell.com>
This commit is contained in:
Lennert Buytenhek 2008-07-10 14:40:51 +02:00 committed by Lennert Buytenhek
parent ae9ae06443
commit cd4ccf76bf
1 changed files with 6 additions and 6 deletions
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12
drivers/net/mv643xx_eth.c
View File

@ -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