--- old/src/hotspot/share/runtime/objectMonitor.cpp	2018-09-17 23:30:30.731743581 -0700
+++ new/src/hotspot/share/runtime/objectMonitor.cpp	2018-09-17 23:30:30.475743590 -0700
@@ -109,7 +109,6 @@
 static int Knob_Poverty             = 1000;
 static int Knob_FixedSpin           = 0;
 static int Knob_PreSpin             = 10;      // 20-100 likely better
-static int Knob_ResetEvent          = 0;
 
 static int Knob_FastHSSEC           = 0;
 static int Knob_MoveNotifyee        = 2;       // notify() - disposition of notifyee
@@ -569,14 +568,8 @@
     // we were spinning.  That's harmless.  If we iterate and call park(),
     // park() will consume the event and return immediately and we'll
     // just spin again.  This pattern can repeat, leaving _succ to simply
-    // spin on a CPU.  Enable Knob_ResetEvent to clear pending unparks().
-    // Alternately, we can sample fired() here, and if set, forgo spinning
-    // in the next iteration.
-
-    if ((Knob_ResetEvent & 1) && Self->_ParkEvent->fired()) {
-      Self->_ParkEvent->reset();
-      OrderAccess::fence();
-    }
+    // spin on a CPU.
+
     if (_succ == Self) _succ = NULL;
 
     // Invariant: after clearing _succ a thread *must* retry _owner before parking.