sky2: reduce default Tx ring size

The default Tx ring size for the sky2 driver is quite large and could
cause excess buffer bloat for many users. The minimum ring size
possible and still allow handling  the worst case packet on 64bit platforms
is 38 which gets rounded up to a power of 2. But most packets only require
a couple of ring elements.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/marvell/sky2.c b/drivers/net/ethernet/marvell/sky2.c
index 98d435a187b101fd529845b34e10731e5587a73c..3777fb348b863477493eda66c4392d03b8285160 100644 (file)
--- a/drivers/net/ethernet/marvell/sky2.c
+++ b/drivers/net/ethernet/marvell/sky2.c
@@ -68,7 +68,7 @@
 #define MAX_SKB_TX_LE  (2 + (sizeof(dma_addr_t)/sizeof(u32))*(MAX_SKB_FRAGS+1))
 #define TX_MIN_PENDING         (MAX_SKB_TX_LE+1)
 #define TX_MAX_PENDING         1024
-#define TX_DEF_PENDING         127
+#define TX_DEF_PENDING         63
 
 #define TX_WATCHDOG            (5 * HZ)
 #define NAPI_WEIGHT            64