mv643xx_eth: shrink default receive and transmit queue sizes

Since the size of the receive queue is directly related to the data
cache footprint of the driver (between refilling a receive ring entry
with a fresh skb and receiving a packet in that entry, queue_size - 1
other skbs will have been touched), shrink the default receive queue
size to a saner number of entries, as 400 is definite overkill for
almost all workloads.

While we are at it, trim the default transmit queue size a bit as well.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>

diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
index 099e0be..4fbd62e 100644 (file)
--- a/drivers/net/mv643xx_eth.c
+++ b/drivers/net/mv643xx_eth.c
@@ -165,8 +165,8 @@ static char mv643xx_eth_driver_version[] = "1.3";
 #define FORCE_LINK_PASS                                (1 << 1)
 #define SERIAL_PORT_ENABLE                     (1 << 0)
 
-#define DEFAULT_RX_QUEUE_SIZE          400
-#define DEFAULT_TX_QUEUE_SIZE          800
+#define DEFAULT_RX_QUEUE_SIZE          128
+#define DEFAULT_TX_QUEUE_SIZE          256
 
 
 /*