Correctly compute the default sizes for the fragments.

This commit was SVN r7299.

ompi/mca/btl/mx/btl_mx_component.c

@@ -133,11 +133,11 @@ int mca_btl_mx_component_open(void)
     mca_btl_mx_module.super.btl_exclusivity =
         mca_btl_mx_param_register_int ("exclusivity", 0);
     mca_btl_mx_module.super.btl_eager_limit = 
-        mca_btl_mx_param_register_int ("first_frag_size", 64*1024) - sizeof(mca_btl_base_header_t);
+        mca_btl_mx_param_register_int ("first_frag_size", 64*1024);
     mca_btl_mx_module.super.btl_min_send_size =
-        mca_btl_mx_param_register_int ("min_send_size", 64*1024) - sizeof(mca_btl_base_header_t);
+        mca_btl_mx_param_register_int ("min_send_size", 64*1024);
     mca_btl_mx_module.super.btl_max_send_size =
-        mca_btl_mx_param_register_int ("max_send_size", 128*1024) - sizeof(mca_btl_base_header_t);
+        mca_btl_mx_param_register_int ("max_send_size", 128*1024);
     mca_btl_mx_module.super.btl_min_rdma_size = 
         mca_btl_mx_param_register_int("min_rdma_size", 1024*1024); 
     mca_btl_mx_module.super.btl_max_rdma_size =