--- a/usr/src/uts/i86pc/os/startup.c	Fri Nov 04 09:14:56 2005 -0800
+++ b/usr/src/uts/i86pc/os/startup.c	Fri Nov 04 10:50:58 2005 -0800
@@ -160,6 +160,8 @@
 caddr_t	rm_platter_va;
 uint32_t rm_platter_pa;
 
+int	auto_lpg_disable = 1;
+
 /*
  * Some CPUs have holes in the middle of the 64-bit virtual address range.
  */
@@ -1706,8 +1708,11 @@
 	cmn_err(CE_CONT, "?mem = %luK (0x%lx)\n",
 	    physinstalled << (MMU_PAGESHIFT - 10), ptob(physinstalled));
 
-	/* For small memory systems disable automatic large pages. */
-	if (physmem < auto_lpg_min_physmem) {
+	/*
+	 * disable automatic large pages for small memory systems or
+	 * when the disable flag is set.
+	 */
+	if (physmem < auto_lpg_min_physmem || auto_lpg_disable) {
 		exec_lpg_disable = 1;
 		use_brk_lpg = 0;
 		use_stk_lpg = 0;