*** old/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp	Thu Jan 27 14:03:13 2011
--- new/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp	Thu Jan 27 14:03:12 2011

*** 110,120 ****
--- 110,127 ----
    size_t yg_cur_size =
      align_size_up(_collector_policy->young_gen_size(), yg_align);
    yg_cur_size = MAX2(yg_cur_size, yg_min_size);
  
    og_min_size = align_size_up(og_min_size, og_align);
    og_max_size = align_size_up(og_max_size, og_align);
+   // Align old gen size down to preserve specified heap size.
+   assert(og_align == yg_align, "sanity");
+   size_t og_size = align_size_down(og_max_size, og_align);
+   if (og_size < og_min_size) {
+     og_max_size = og_min_size;
+   } else {
+     og_max_size = og_size;
+   }
    size_t og_cur_size =
      align_size_up(_collector_policy->old_gen_size(), og_align);
    og_cur_size = MAX2(og_cur_size, og_min_size);
  
    pg_min_size = align_size_up(pg_min_size, pg_align);