diff -r a5ede748a1d9 -r f576478175f1 src/mem/ruby/system/System.cc
--- a/src/mem/ruby/system/System.cc	Tue Oct 02 14:35:46 2012 -0500
+++ b/src/mem/ruby/system/System.cc	Thu Oct 04 10:32:06 2012 -0500
@@ -354,8 +354,9 @@
         Tick curtick_original = curTick();
         // save the event queue head
         Event* eventq_head = eventq->replaceHead(NULL);
-        // set curTick to 0
+        // set curTick to 0 and reset Ruby System's clock
         curTick(0);
+        resetClock();
 
         // Schedule an event to start cache warmup
         enqueueRubyEvent(curTick());
@@ -369,8 +370,9 @@
         m_memory_controller->reset();
         // Restore eventq head
         eventq_head = eventq->replaceHead(eventq_head);
-        // Restore curTick
+        // Restore curTick and Ruby System's clock
         curTick(curtick_original);
+        resetClock();
     }
 }
 
diff -r a5ede748a1d9 -r f576478175f1 src/sim/clocked_object.hh
--- a/src/sim/clocked_object.hh	Tue Oct 02 14:35:46 2012 -0500
+++ b/src/sim/clocked_object.hh	Thu Oct 04 10:32:06 2012 -0500
@@ -119,6 +119,18 @@
      */
     virtual ~ClockedObject() { }
 
+    /**
+     * Reset the object's clock using the current global tick value. Likely
+     * to be used only when the global clock is reset. Currently, this done
+     * only when Ruby is done warming up the memory system.
+     */
+    void resetClock() const
+    {
+        Cycles elapsedCycles(divCeil(curTick(), clock));
+        cycle = elapsedCycles;
+        tick = elapsedCycles * clock;
+    }
+
   public:
 
     /**