--- 2.4.21pre4aa3/include/linux/sysctl.h.~1~	2003-02-24 19:15:04.000000000 +0100
+++ 2.4.21pre4aa3/include/linux/sysctl.h	2003-03-01 04:32:55.000000000 +0100
@@ -127,6 +127,7 @@ enum
 	KERN_CADPID=54,		/* int: PID of the process to notify on CAD */
 	KERN_SHMUSEBIGPAGES=55,	/* int: use bigpages wherever possible */
  	KERN_CORE_PATTERN=56,	/* string: pattern for core-files */
+ 	KERN_SCHED_YIELD_SCALE=57, /* int: select between scalable or interactive */
 };
 
 
--- 2.4.21pre4aa3/kernel/sched.c.~1~	2003-02-24 19:12:54.000000000 +0100
+++ 2.4.21pre4aa3/kernel/sched.c	2003-03-01 04:29:12.000000000 +0100
@@ -1471,6 +1471,8 @@ out_unlock:
 	return retval;
 }
 
+int sysctl_sched_yield_scale = 1;
+
 asmlinkage long sys_sched_yield(void)
 {
 	runqueue_t *rq = this_rq();
@@ -1498,6 +1500,12 @@ 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);
--- 2.4.21pre4aa3/kernel/sysctl.c.~1~	2003-02-24 19:12:54.000000000 +0100
+++ 2.4.21pre4aa3/kernel/sysctl.c	2003-03-01 04:31:47.000000000 +0100
@@ -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;
@@ -272,6 +273,8 @@ static ctl_table kern_table[] = {
 	{KERN_S390_USER_DEBUG_LOGGING,"userprocess_debug",
 	 &sysctl_userprocess_debug,sizeof(int),0644,NULL,&proc_dointvec},
 #endif
+	{KERN_SCHED_YIELD_SCALE, "sched_yield_scale",
+	 &sysctl_sched_yield_scale, sizeof(int), 0644, NULL, &proc_dointvec},
 	{0}
 };