diff --git a/lladd/constants.h b/lladd/constants.h
index 440ae21..e22777d 100644
--- a/lladd/constants.h
+++ b/lladd/constants.h
@@ -80,11 +80,11 @@ terms specified in this license.
 
 #define PAGE_SIZE 4096
 
-#define MAX_BUFFER_SIZE 100003 
+//#define MAX_BUFFER_SIZE 100003 
 /*#define MAX_BUFFER_SIZE 20029 */
 //#define MAX_BUFFER_SIZE 10007 
 //#define MAX_BUFFER_SIZE 5003
-//#define MAX_BUFFER_SIZE 2003 
+#define MAX_BUFFER_SIZE 2003 
 /* #define MAX_BUFFER_SIZE 71  */
 /*#define MAX_BUFFER_SIZE 7 */
 
@@ -134,6 +134,8 @@ terms specified in this license.
 
 #define OPERATION_ALLOC_BOUNDARY_TAG 35
 
+#define OPERATION_FIXED_PAGE_ALLOC 36
+
 // these operations are specific to OASYS
 #define OPERATION_OASYS_DIFF_DO           75  
 #define OPERATION_OASYS_DIFF_REDO         76