diff -r 0dc88ad3244e -r 6476042f815c src/cpu/sparc/vm/globals_sparc.hpp
--- a/src/cpu/sparc/vm/globals_sparc.hpp	Tue Apr 06 15:18:10 2010 -0700
+++ b/src/cpu/sparc/vm/globals_sparc.hpp	Wed Apr 07 09:37:47 2010 -0700
@@ -40,6 +40,9 @@
 define_pd_global(bool, UncommonNullCast,            true);  // Uncommon-trap NULLs past to check cast
 
 define_pd_global(intx, CodeEntryAlignment,    32);
+// The default setting 16/16 seems to work best.
+// (For _228_jack 16/16 is 2% better than 4/4, 16/4, 32/32, 32/16, or 16/32.)
+define_pd_global(intx, OptoLoopAlignment,     16);  // = 4*wordSize
 define_pd_global(intx, InlineFrequencyCount,  50);  // we can use more inlining on the SPARC
 define_pd_global(intx, InlineSmallCode,       1500);
 #ifdef _LP64