diff -r 463ad1f3e1eb -r c62b2cbd4dde hotspot/src/share/vm/runtime/arguments.cpp
--- a/hotspot/src/share/vm/runtime/arguments.cpp	Tue Jul 29 14:48:25 2008 -0700
+++ b/hotspot/src/share/vm/runtime/arguments.cpp	Wed Jul 30 09:54:21 2008 -0700
@@ -1176,9 +1176,7 @@
   // by ergonomics.
   if (MaxHeapSize <= max_heap_for_compressed_oops()) {
     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
-      // Leave compressed oops off by default. Uncomment
-      // the following line to return it to default status.
-      // FLAG_SET_ERGO(bool, UseCompressedOops, true);
+      FLAG_SET_ERGO(bool, UseCompressedOops, true);
     }
   } else {
     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {