diff --git a/src/mca/pml/ob1/pml_ob1_component.c b/src/mca/pml/ob1/pml_ob1_component.c
index a18f8d319a..94d0f0f5e6 100644
--- a/src/mca/pml/ob1/pml_ob1_component.c
+++ b/src/mca/pml/ob1/pml_ob1_component.c
@@ -115,9 +115,9 @@ int mca_pml_ob1_component_open(void)
     mca_pml_ob1.recv_pipeline_depth =
         mca_pml_ob1_param_register_int("recv_pipeline_depth", 3);
     mca_pml_ob1.rdma_threshold = 
-        mca_pml_ob1_param_register_int("rdma_threshold", 256*1024); 
+        mca_pml_ob1_param_register_int("rdma_threshold", 1024*1024); 
     mca_pml_ob1.rdma_offset = 
-        mca_pml_ob1_param_register_int("rdma_offset", 128*1024); 
+        mca_pml_ob1_param_register_int("rdma_offset", 512*1024); 
 
     return mca_bmi_base_open();
 }
diff --git a/src/mca/pml/ob1/pml_ob1_sendreq.c b/src/mca/pml/ob1/pml_ob1_sendreq.c
index 6263468600..e485f797be 100644
--- a/src/mca/pml/ob1/pml_ob1_sendreq.c
+++ b/src/mca/pml/ob1/pml_ob1_sendreq.c
@@ -386,6 +386,8 @@ int mca_pml_ob1_send_request_schedule(mca_pml_ob1_send_request_t* sendreq)
                 }
                                                                                                                   
                 /* pack into a descriptor */
+                ompi_convertor_set_position(&sendreq->req_send.req_convertor, 
+                    &sendreq->req_send_offset);
                 des = ep->bmi_prepare_src(
                     ep->bmi,
                     ep->bmi_endpoint,