diff -r 331eaa715e58 -r bfcb639d5bca src/share/vm/runtime/globals.hpp
--- a/src/share/vm/runtime/globals.hpp	Wed Aug 20 11:23:58 2008 -0700
+++ b/src/share/vm/runtime/globals.hpp	Wed Aug 20 15:41:36 2008 -0700
@@ -1443,7 +1443,7 @@
           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
           " ratio")                                                         \
                                                                             \
-  product(bool, CMSPrecleanRefLists1, true,                                 \
+  product(bool, CMSPrecleanRefLists1, false,                                \
           "Preclean ref lists during (initial) preclean phase")             \
                                                                             \
   product(bool, CMSPrecleanRefLists2, false,                                \