diff --git a/src/datatype/datatype.h b/src/datatype/datatype.h
index 0b05e044e1..78299b1300 100644
--- a/src/datatype/datatype.h
+++ b/src/datatype/datatype.h
@@ -208,20 +208,19 @@ typedef struct __dt_stack {
 
 struct ompi_convertor_t {
     ompi_object_t           super;              /**< basic superclass */
-    dt_desc_t*              pDesc;              /**< the datatype description associated with the convertor */
     uint32_t                remoteArch;         /**< the remote architecture */
-    uint32_t                converted;          /**< the number of already converted elements */
-    uint32_t                bConverted;         /**< the size of already converted elements in bytes */
     uint32_t                flags;              /**< the properties of this convertor */
+    dt_desc_t*              pDesc;              /**< the datatype description associated with the convertor */
     uint32_t                count;              /**< the total number of full datatype elements */
-    dt_stack_t*             pStack;             /**< the local stack for the actual conversion */
-    uint32_t                stack_pos;          /**< the actual position on the stack */
-    uint32_t                stack_size;         /**< size of the allocated stack */
     char*                   pBaseBuf;           /**< initial buffer as supplied by the user */
-    uint32_t                available_space;    /**< total available space */
+    dt_stack_t*             pStack;             /**< the local stack for the actual conversion */
+    uint32_t                stack_size;         /**< size of the allocated stack */
     convertor_advance_fct_t fAdvance;           /**< pointer to the pack/unpack functions */
     memalloc_fct_t          memAlloc_fn;        /**< pointer to the memory allocation function */
     conversion_fct_t*       pFunctions;         /**< the convertor functions pointer */
+    /* All others fields get modified for every call to pack/unpack functions */
+    uint32_t                stack_pos;          /**< the actual position on the stack */
+    uint32_t                bConverted;         /**< the size of already converted elements in bytes */
     dt_stack_t              static_stack[DT_STATIC_STACK_SIZE];  /**< local stack to be used for contiguous data */
 };
 OBJ_CLASS_DECLARATION( ompi_convertor_t );
@@ -309,7 +308,6 @@ static inline int ompi_convertor_copy( const ompi_convertor_t* pSrcConv, ompi_co
     pDestConv->pStack          = pDestConv->static_stack;
     pDestConv->stack_size      = DT_STATIC_STACK_SIZE;
     pDestConv->stack_pos       = 0;
-    pDestConv->available_space = 0;
     pDestConv->pFunctions      = pSrcConv->pFunctions;
 
    return OMPI_SUCCESS;
diff --git a/src/datatype/datatype_internal.h b/src/datatype/datatype_internal.h
index d21b1bfe6b..a1edf6ddf6 100644
--- a/src/datatype/datatype_internal.h
+++ b/src/datatype/datatype_internal.h
@@ -368,9 +368,7 @@ int ompi_convertor_create_stack_at_begining( ompi_convertor_t* pConvertor, const
     } else {
         ompi_output( 0, "Here we should have a data in the datatype description\n" );
     }
-    /* And set the correct status */
-    pConvertor->converted          = 0;
-    pConvertor->bConverted         = 0;
+    pConvertor->bConverted = 0;
     return OMPI_SUCCESS;
 }
 
@@ -396,10 +394,7 @@ convertor_init_generic( ompi_convertor_t* pConv, const dt_desc_t* datatype, int
     }
     
     pConv->pBaseBuf = (void*)pUserBuf;
-    pConv->available_space = count * (datatype->ub - datatype->lb);
     pConv->count = count;
-    pConv->converted = 0;
-    pConv->bConverted = 0;
 }
 
 #if defined(c_plusplus) || defined(__cplusplus)
diff --git a/src/datatype/dt_pack.c b/src/datatype/dt_pack.c
index c11b41b598..9e01bf8163 100644
--- a/src/datatype/dt_pack.c
+++ b/src/datatype/dt_pack.c
@@ -127,7 +127,6 @@ int ompi_convertor_pack_general( ompi_convertor_t* pConvertor,
                         printf( "pack there is still room in the input buffer %d bytes\n", iCount );
                     goto complete_loop;
                 }
-                pConvertor->converted += rc;  /* number of elementd converted so far */
                 pos_desc++;  /* advance to the next data */
                 count_desc = pElem[pos_desc].count;
                 disp_desc = pElem[pos_desc].disp;
diff --git a/src/datatype/dt_unpack.c b/src/datatype/dt_unpack.c
index e6139d9330..60401150c6 100644
--- a/src/datatype/dt_unpack.c
+++ b/src/datatype/dt_unpack.c
@@ -138,7 +138,6 @@ static int ompi_convertor_unpack_general( ompi_convertor_t* pConvertor,
                         printf( "unpack there is still room in the input buffer %d bytes\n", iCount );
                     goto save_and_return;
                 }
-                pConvertor->converted += rc;  /* number of elements converted so far */
                 pos_desc++;  /* advance to the next data */
                 count_desc = pElems[pos_desc].count;
                 disp_desc = pElems[pos_desc].disp;
diff --git a/src/datatype/fake_stack.c b/src/datatype/fake_stack.c
index 1d5865030a..88e5e813b6 100644
--- a/src/datatype/fake_stack.c
+++ b/src/datatype/fake_stack.c
@@ -82,10 +82,6 @@ int ompi_convertor_create_stack_with_pos_general( ompi_convertor_t* pConvertor,
     pStack->count    = pConvertor->count;
     pStack->index    = -1;
     if( pConvertor->flags & CONVERTOR_HOMOGENEOUS ) {
-        if( pData->opt_desc.desc != NULL ) {
-            pElems = pData->opt_desc.desc;
-            pStack->end_loop = pData->opt_desc.used;
-        }
 
         loop_length = GET_FIRST_NON_LOOP( pElems );
         pStack->disp = pElems[loop_length].disp;