src/share/vm/runtime/arguments.cpp

@@ -1962,16 +1962,13 @@
     FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
   }
 
   if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
     // In G1, we want the default GC overhead goal to be higher than
-    // say in PS. So we set it here to 10%. Otherwise the heap might
-    // be expanded more aggressively than we would like it to. In
-    // fact, even 10% seems to not be high enough in some cases
-    // (especially small GC stress tests that the main thing they do
-    // is allocation). We might consider increase it further.
-    FLAG_SET_DEFAULT(GCTimeRatio, 9);
+    // it is for PS, or the heap might be expanded too aggressively.
+    // We set it here to ~8%.
+    FLAG_SET_DEFAULT(GCTimeRatio, 12);
   }
 
   if (PrintGCDetails && Verbose) {
     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
       (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));