diff -r 90a66aa50514 -r d0994e5bebce src/os_cpu/solaris_x86/vm/orderAccess_solaris_x86.inline.hpp
--- a/src/os_cpu/solaris_x86/vm/orderAccess_solaris_x86.inline.hpp	Tue Mar 24 15:09:52 2009 -0700
+++ b/src/os_cpu/solaris_x86/vm/orderAccess_solaris_x86.inline.hpp	Thu Mar 26 14:31:45 2009 -0700
@@ -61,11 +61,8 @@
 #endif // AMD64
   }
   inline void _OrderAccess_fence() {
-#ifdef AMD64
-    __asm__ __volatile__ ("mfence":::"memory");
-#else
+    // Always use locked addl since mfence is sometimes expensive
     __asm__ volatile ("lock; addl $0,0(%%esp)" : : : "cc", "memory");
-#endif // AMD64
   }
 
 }