ixgb: fix cache miss due to miscalculation

Reduce writeback threshold by 1. We were instructing the hardware to
wait until the 17th descriptor which went over the cache line limit.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Auke Kok <auke.jan.h.kok@intel.com>

diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c
index 7bbd447..770eef2 100644 (file)
--- a/drivers/net/ixgb/ixgb_main.c
+++ b/drivers/net/ixgb/ixgb_main.c
@@ -140,12 +140,12 @@ module_param(debug, int, 0);
 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
 
 /* some defines for controlling descriptor fetches in h/w */
-#define RXDCTL_WTHRESH_DEFAULT 16      /* chip writes back at this many or RXT0 */
-#define RXDCTL_PTHRESH_DEFAULT 0               /* chip considers prefech below
-                                                * this */
-#define RXDCTL_HTHRESH_DEFAULT 0               /* chip will only prefetch if tail
-                                                * is pushed this many descriptors
-                                                * from head */
+#define RXDCTL_WTHRESH_DEFAULT 15  /* chip writes back at this many or RXT0 */
+#define RXDCTL_PTHRESH_DEFAULT 0   /* chip considers prefech below
+                                    * this */
+#define RXDCTL_HTHRESH_DEFAULT 0   /* chip will only prefetch if tail
+                                    * is pushed this many descriptors
+                                    * from head */
 
 /**
  * ixgb_init_module - Driver Registration Routine