diff -r b32d8f04648b -r 27c4307d6cda hotspot/src/share/vm/runtime/globals.hpp
--- a/hotspot/src/share/vm/runtime/globals.hpp	Thu Mar 27 22:36:08 2014 +0100
+++ b/hotspot/src/share/vm/runtime/globals.hpp	Fri Mar 28 21:04:37 2014 -0700
@@ -2423,9 +2423,9 @@
           "Number of gclog files in rotation "                              \
           "(default: 0, no rotation)")                                      \
                                                                             \
-  product(uintx, GCLogFileSize, 0,                                          \
-          "GC log file size (default: 0 bytes, no rotation). "              \
-          "It requires UseGCLogFileRotation")                               \
+  product(uintx, GCLogFileSize, 8*K,                                        \
+          "GC log file size, requires UseGCLogFileRotation. "               \
+          "Set to 0 to only trigger rotation via jcmd")                     \
                                                                             \
   /* JVMTI heap profiling */                                                \
                                                                             \