diff -urNp --exclude CVS --exclude BitKeeper x-ref/include/linux/sysctl.h x/include/linux/sysctl.h
--- x-ref/include/linux/sysctl.h	2003-07-17 11:21:28.000000000 +0200
+++ x/include/linux/sysctl.h	2003-07-17 11:21:59.000000000 +0200
@@ -132,6 +132,7 @@ enum
 	KERN_SHMBIGPAGESPERFILE=59, /* int: max bigpages per file */
 	KERN_MAXTIMESLICE=60,	/* int: nice -20 max timeslice */
 	KERN_MINTIMESLICE=61,	/* int: nice +19 min timeslice */
+	KERN_SCHED_YIELD_SCALE=62, /* int: select between scalable or interactive */
 };
 
 
diff -urNp --exclude CVS --exclude BitKeeper x-ref/kernel/sched.c x/kernel/sched.c
--- x-ref/kernel/sched.c	2003-07-17 11:21:28.000000000 +0200
+++ x/kernel/sched.c	2003-07-17 11:21:29.000000000 +0200
@@ -1484,6 +1484,8 @@ out_unlock:
 	return retval;
 }
 
+int sysctl_sched_yield_scale = 1;
+
 asmlinkage long sys_sched_yield(void)
 {
 	runqueue_t *rq = this_rq();
@@ -1511,6 +1513,12 @@ asmlinkage long sys_sched_yield(void)
 	if (unlikely(array == rq->expired) && rq->active->nr_active)
 		goto out_unlock;
 
+	if (sysctl_sched_yield_scale) {
+		dequeue_task(current, array);
+		enqueue_task(current, rq->expired);
+		goto out_unlock;
+	}
+
 	list_del(&current->run_list);
 	if (!list_empty(array->queue + current->prio)) {
 		list_add(&current->run_list, array->queue[current->prio].next);
diff -urNp --exclude CVS --exclude BitKeeper x-ref/kernel/sysctl.c x/kernel/sysctl.c
--- x-ref/kernel/sysctl.c	2003-07-17 11:21:28.000000000 +0200
+++ x/kernel/sysctl.c	2003-07-17 11:22:19.000000000 +0200
@@ -54,6 +54,7 @@ extern int sysrq_enabled;
 extern int core_uses_pid;
 extern char core_pattern[];
 extern int cad_pid;
+extern int sysctl_sched_yield_scale;
 
 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 static int maxolduid = 65535;
@@ -288,6 +289,8 @@ static ctl_table kern_table[] = {
 	 &MAX_TIMESLICE,sizeof(int),0644,NULL,&proc_dointvec},
 	{KERN_MINTIMESLICE, "min-timeslice",
 	 &MIN_TIMESLICE,sizeof(int),0644,NULL,&proc_dointvec},
+	{KERN_SCHED_YIELD_SCALE, "sched_yield_scale",
+	 &sysctl_sched_yield_scale, sizeof(int), 0644, NULL, &proc_dointvec},
 	{0}
 };