[PATCH] S2io: Performance improvements

Hi,
This patch relates to mostly performance related changes.
1. Fixed incorrect computation of PANIC level in rx_buffer_level().
2. Removed unnecessary PIOs(read/write of tx_traffic_int and
   rx_traffic_int) from interrupt handler and removed read of
   general_int_status register from xmit routine.
3. Enable two-buffer mode(for Rx path) automatically for SGI
   systems. This improves Rx performance dramatically on
   SGI systems.

Signed-off-by: Ravinandan Arakali <ravinandan.arakali@neterion.com>
Signed-off-by: Raghavendra Koushik <raghavendra.koushik@neterion.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/net/s2io.h b/drivers/net/s2io.h
index 69dd0e51dda0..ce9bf6d5ee00 100644
--- a/drivers/net/s2io.h
+++ b/drivers/net/s2io.h
@@ -13,6 +13,11 @@
 #ifndef _S2IO_H
 #define _S2IO_H
 
+/* Enable 2 buffer mode by default for SGI system */
+#ifdef CONFIG_IA64_SGI_SN2
+#define CONFIG_2BUFF_MODE
+#endif
+
 #define TBD 0
 #define BIT(loc)                (0x8000000000000000ULL >> (loc))
 #define vBIT(val, loc, sz)      (((u64)val) << (64-loc-sz))