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| author | Lennert Buytenhek <buytenh@wantstofly.org> | 2008-07-10 14:40:51 +0200 |
|---|---|---|
| committer | Lennert Buytenhek <buytenh@marvell.com> | 2008-07-24 06:22:51 +0200 |
| commit | cd4ccf76bfd2c36d351e68be7e6a597268f98a1a (patch) | |
| tree | a9c63d6536d1c49cbb350c238b903a4f05036dcb /drivers/net/mv643xx_eth.c | |
| parent | ae9ae06443f7bfa4f013c0e2c035d549e999ad3e (diff) | |
| download | talos-obmc-linux-cd4ccf76bfd2c36d351e68be7e6a597268f98a1a.tar.gz talos-obmc-linux-cd4ccf76bfd2c36d351e68be7e6a597268f98a1a.zip | |
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>
Diffstat (limited to 'drivers/net/mv643xx_eth.c')
| -rw-r--r-- | drivers/net/mv643xx_eth.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c index c700c1f494e9..9d200568d88a 100644 --- a/drivers/net/mv643xx_eth.c +++ b/drivers/net/mv643xx_eth.c @@ -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 |
