diff --git a/sys/vm/vm_map.c b/sys/vm/vm_map.c
--- a/sys/vm/vm_map.c
+++ b/sys/vm/vm_map.c
@@ -1980,6 +1980,11 @@
     &cluster_anon, 0,
     "Cluster anonymous mappings: 0 = no, 1 = yes if no hint, 2 = always");
 
+static int anon_low_pref = 0;
+SYSCTL_INT(_vm, OID_AUTO, anon_low_pref, CTLFLAG_RW,
+    &anon_low_pref, 0,
+    "Prefer lower addresses when clustering anonymous mappings: 0 = no, 1 = yes");
+
 static bool
 clustering_anon_allowed(vm_offset_t addr)
 {
@@ -2127,6 +2132,8 @@
 		curr_min_addr = map->anon_loc;
 		if (curr_min_addr == 0)
 			cluster = false;
+		else if (anon_low_pref)
+			update_anon = false;
 	}
 	if (find_space != VMFS_NO_SPACE) {
 		KASSERT(find_space == VMFS_ANY_SPACE ||