Index: ompi/mca/pml/ob1/pml_ob1_recvreq.c
===================================================================
--- ompi/mca/pml/ob1/pml_ob1_recvreq.c	(revision 14870)
+++ ompi/mca/pml/ob1/pml_ob1_recvreq.c	(working copy)
@@ -33,6 +33,9 @@

 static mca_pml_ob1_recv_frag_t* mca_pml_ob1_recv_request_match_specific_proc(
     mca_pml_ob1_recv_request_t* request, mca_pml_ob1_comm_proc_t* proc);
+static inline int
+mca_pml_ob1_recv_request_schedule_btl_exclusive( mca_bml_base_btl_t* bml_btl,
+                                                 mca_pml_ob1_recv_request_t* recvreq );

 void mca_pml_ob1_recv_request_process_pending(void)
 {
@@ -170,7 +173,7 @@
         MCA_PML_OB1_RECV_REQUEST_PML_COMPLETE( recvreq );
     } else if (recvreq->req_rdma_offset < recvreq->req_send_offset) {
         /* schedule additional rdma operations */
-        mca_pml_ob1_recv_request_schedule(recvreq);
+        mca_pml_ob1_recv_request_schedule_btl_exclusive(bml_btl, recvreq);
     }
     MCA_PML_OB1_PROGRESS_PENDING(bml_btl);
 }
@@ -582,7 +585,128 @@
     MCA_PML_OB1_RECV_REQUEST_PML_COMPLETE( recvreq );
 }

+static inline int
+mca_pml_ob1_recv_request_schedule_btl_exclusive( mca_bml_base_btl_t* bml_btl,
+                                                 mca_pml_ob1_recv_request_t* recvreq )
+{
+    size_t bytes_remaining = recvreq->req_recv.req_bytes_packed -
+        recvreq->req_rdma_offset;
+    size_t size;
+    int rc = OMPI_SUCCESS;
+    size_t hdr_size;
+    mca_pml_ob1_rdma_hdr_t* hdr;
+    mca_btl_base_descriptor_t* dst;
+    mca_btl_base_descriptor_t* ctl;
+    mca_mpool_base_registration_t * reg = NULL;

+    if( 0 == bytes_remaining ||
+        recvreq->req_pipeline_depth >= mca_pml_ob1.recv_pipeline_depth ) {
+        return OMPI_SUCCESS;
+    }
+
+    ompi_convertor_set_position(&recvreq->req_recv.req_convertor,
+                                &recvreq->req_rdma_offset);
+    /*
+     * If more than one NIC is available - try to use both for
+     * anything larger than the eager limit
+     */
+    if( bytes_remaining < bml_btl->btl_eager_limit ) {
+        size = bytes_remaining;
+    } else {
+        /* 
+         * otherwise attempt to give the BTL a percentage of
+         * the message based on a weighting factor. for
+         * simplicity calculate this as a percentage of the
+         * overall message length (regardless of amount
+         * previously assigned)
+         */
+        size = (size_t)(bml_btl->btl_weight * bytes_remaining);
+    }
+    /* makes sure that we don't exceed BTL max rdma size
+     * if memory is not pinned already */
+    if( size > bml_btl->btl_rdma_pipeline_frag_size ) {
+        size = bml_btl->btl_rdma_pipeline_frag_size;
+    }
+
+    /*
+     * Select the next btl out of the list w/ preregistered memory.
+     */
+    reg = recvreq->req_rdma[bml_btl->btl_index].btl_reg;
+
+    /* prepare a descriptor for RDMA */
+    mca_bml_base_prepare_dst(bml_btl, reg,
+                             &recvreq->req_recv.req_convertor, MCA_BTL_NO_ORDER,
+                             0, &size, &dst);
+
+    if(dst == NULL) {
+        return OMPI_ERR_OUT_OF_RESOURCE;
+    }
+    dst->des_cbfunc = mca_pml_ob1_put_completion;
+    dst->des_cbdata = recvreq;
+
+    /*opal_output( 0, "prepare RDMA fragment with a size of %ld bytes\n", size );*/
+
+    /* prepare a descriptor for rdma control message */
+    hdr_size = sizeof(mca_pml_ob1_rdma_hdr_t);
+    if(dst->des_dst_cnt > 1) {
+        hdr_size += (sizeof(mca_btl_base_segment_t) *
+                     (dst->des_dst_cnt-1));
+    }
+
+    MCA_PML_OB1_DES_ALLOC(bml_btl, ctl, MCA_BTL_NO_ORDER, hdr_size);
+    if(ctl == NULL) {
+        mca_bml_base_free(bml_btl,dst);
+        return OMPI_ERR_OUT_OF_RESOURCE;
+    }
+    ctl->des_flags |= MCA_BTL_DES_FLAGS_PRIORITY;
+    ctl->des_cbfunc = mca_pml_ob1_recv_ctl_completion;
+            
+    /* fill in rdma header */
+    hdr = (mca_pml_ob1_rdma_hdr_t*)ctl->des_src->seg_addr.pval;
+    hdr->hdr_common.hdr_type = MCA_PML_OB1_HDR_TYPE_PUT;
+    hdr->hdr_common.hdr_flags =
+        (!recvreq->req_ack_sent) ? MCA_PML_OB1_HDR_TYPE_ACK : 0;
+    hdr->hdr_req = recvreq->req_send;
+    hdr->hdr_des.pval = dst;
+    hdr->hdr_rdma_offset = recvreq->req_rdma_offset;
+    hdr->hdr_seg_cnt = dst->des_dst_cnt;
+    memcpy(hdr->hdr_segs, dst->des_dst,
+           dst->des_dst_cnt * sizeof(mca_btl_base_segment_t));
+    if(!recvreq->req_ack_sent)
+        recvreq->req_ack_sent = true;
+#if OMPI_ENABLE_HETEROGENEOUS_SUPPORT
+#ifdef WORDS_BIGENDIAN
+    hdr->hdr_common.hdr_flags |= MCA_PML_OB1_HDR_FLAGS_NBO;
+#else
+    /* if we are little endian and the remote side is big endian,
+       we're responsible for making sure the data is in network byte
+       order */
+    /* RDMA is currently disabled by bml if arch doesn't
+       match, so this shouldn't be needed.  here to make sure
+       we remember if we ever change the bml. */
+    assert(0 == (recvreq->req_recv.req_base.req_proc->proc_arch & 
+                 OMPI_ARCH_ISBIGENDIAN));
+#endif
+#endif
+
+    PERUSE_TRACE_COMM_OMPI_EVENT( PERUSE_COMM_REQ_XFER_CONTINUE,
+                                  &(recvreq->req_recv.req_base), size,
+                                  PERUSE_RECV);
+
+    /* send rdma request to peer */
+    rc = mca_bml_base_send(bml_btl, ctl, MCA_BTL_TAG_PML);
+    if(rc == OMPI_SUCCESS) {
+        /* update request state */
+        recvreq->req_rdma_offset += size;
+        OPAL_THREAD_ADD_SIZE_T(&recvreq->req_pipeline_depth,1);
+        bytes_remaining -= size;
+    } else {
+        mca_bml_base_free(bml_btl,ctl);
+        mca_bml_base_free(bml_btl,dst);
+    }
+    return rc;
+}
+
 /*
  * Schedule RDMA protocol.
  *
@@ -688,10 +812,11 @@
             if(dst == NULL) {
                 continue;
             }
-
             dst->des_cbfunc = mca_pml_ob1_put_completion;
             dst->des_cbdata = recvreq;

+            /*opal_output( 0, "prepare RDMA fragment with a size of %ld bytes\n", size );*/
+
             /* prepare a descriptor for rdma control message */
             hdr_size = sizeof(mca_pml_ob1_rdma_hdr_t);
             if(dst->des_dst_cnt > 1) {