Do not set the stack for this convertor. As NOBODY is supposed to use it we can have it uninitialized in order to decrease the initial overhead for the first fragment.

This commit was SVN r5947.

src/mca/pml/base/pml_base_sendreq.h

@@ -108,7 +108,7 @@ typedef struct mca_pml_base_send_request_t mca_pml_base_send_request_t;
                                        (request)->req_base.req_datatype,  \
                                        (request)->req_base.req_count,     \
                                        (request)->req_base.req_addr,      \
-                                       0, NULL );                         \
+                                       -1, NULL );                        \
          ompi_convertor_get_packed_size( &(request)->req_convertor,       \
                               (uint32_t*)&((request)->req_bytes_packed) );\
       } else {                                                            \