--- linux-2.6.0-test5-mm1-O20/kernel/sched.c	2003-09-10 11:15:45.000000000 +1000
+++ linux-2.6.0-test5-mm1/kernel/sched.c	2003-09-10 11:51:38.000000000 +1000
@@ -14,6 +14,7 @@
  *		an array-switch method of distributing timeslices
  *		and per-CPU runqueues.  Cleanups and useful suggestions
  *		by Davide Libenzi, preemptible kernel bits by Robert Love.
+ *  2003-09-03	Interactivity tuning by Con Kolivas.
  */
 
 #include <linux/mm.h>
@@ -122,12 +123,12 @@
 		MAX_SLEEP_AVG)
 
 #ifdef CONFIG_SMP
-#define TIMESLICE_GRANULARITY(p) \
-	(MIN_TIMESLICE * (1 << (MAX_BONUS - CURRENT_BONUS(p))) * \
-		num_online_cpus())
+#define TIMESLICE_GRANULARITY(p)	(MIN_TIMESLICE * \
+		(1 << (((MAX_BONUS - CURRENT_BONUS(p)) ? : 1) - 1)) * \
+			num_online_cpus())
 #else
-#define TIMESLICE_GRANULARITY(p) \
-	(MIN_TIMESLICE * (1 << (MAX_BONUS - CURRENT_BONUS(p))))
+#define TIMESLICE_GRANULARITY(p)	(MIN_TIMESLICE * \
+		(1 << (((MAX_BONUS - CURRENT_BONUS(p)) ? : 1) - 1)))
 #endif
 
 #define SCALE(v1,v1_max,v2_max) \