--- src/sys/kern/kern_switch.c.orig	Wed Jan 26 14:36:02 2005
+++ src/sys/kern/kern_switch.c	Wed Jan 26 14:39:05 2005
@@ -285,6 +285,12 @@
 
 	ke = td->td_kse;
 	CTR1(KTR_RUNQ, "adjustrunqueue: td%p", td);
+
+	/*
+	 * Do not adjust the priority of an idle thread.
+	 */
+	if (td->td_flags & TDF_IDLETD)
+		return;
 	/*
 	 * If it is not a threaded process, take the shortcut.
 	 */