Index: src/sys/amd64/amd64/machdep.c
===================================================================
RCS file: /home/ncvs/src/sys/amd64/amd64/machdep.c,v
retrieving revision 1.638.2.10
diff -u -r1.638.2.10 machdep.c
--- src/sys/amd64/amd64/machdep.c	30 Oct 2006 18:03:02 -0000	1.638.2.10
+++ src/sys/amd64/amd64/machdep.c	17 Nov 2006 02:25:51 -0000
@@ -531,6 +531,7 @@
  * help lock contention somewhat, and this is critical for HTT. -Peter
  */
 static int	cpu_idle_hlt = 1;
+TUNABLE_INT("machdep.cpu_idle_hlt", &cpu_idle_hlt);
 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
     &cpu_idle_hlt, 0, "Idle loop HLT enable");
 
Index: src/sys/i386/i386/machdep.c
===================================================================
RCS file: /home/ncvs/src/sys/i386/i386/machdep.c,v
retrieving revision 1.616.2.8
diff -u -r1.616.2.8 machdep.c
--- src/sys/i386/i386/machdep.c	11 Sep 2006 18:41:31 -0000	1.616.2.8
+++ src/sys/i386/i386/machdep.c	17 Nov 2006 02:25:52 -0000
@@ -1107,6 +1107,7 @@
  * help lock contention somewhat, and this is critical for HTT. -Peter
  */
 static int	cpu_idle_hlt = 1;
+TUNABLE_INT("machdep.cpu_idle_hlt", &cpu_idle_hlt);
 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
     &cpu_idle_hlt, 0, "Idle loop HLT enable");