--- old/src/share/vm/runtime/arguments.cpp	2013-09-13 17:13:58.773025301 +0200
+++ new/src/share/vm/runtime/arguments.cpp	2013-09-13 17:13:58.713025303 +0200
@@ -1126,6 +1126,9 @@
     Tier3InvokeNotifyFreqLog = 0;
     Tier4InvocationThreshold = 0;
   }
+  if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
+    FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
+  }
 }
 
 #if INCLUDE_ALL_GCS