diff --git a/fabtests/Makefile.am b/fabtests/Makefile.am
index b97ca169e5f..17572aa02a4 100644
--- a/fabtests/Makefile.am
+++ b/fabtests/Makefile.am
@@ -41,6 +41,7 @@ bin_PROGRAMS = \
 	functional/fi_rdm_stress \
 	functional/fi_multi_recv \
 	functional/fi_bw \
+	functional/fi_flood \
 	functional/fi_rdm_multi_client \
 	functional/fi_loopback \
 	benchmarks/fi_msg_pingpong \
@@ -362,6 +363,10 @@ functional_fi_bw_SOURCES = \
 	functional/bw.c
 functional_fi_bw_LDADD = libfabtests.la
 
+functional_fi_flood_SOURCES = \
+	 functional/flood.c
+functional_fi_flood_LDADD = libfabtests.la
+
 functional_fi_rdm_multi_client_SOURCES = \
 	functional/rdm_multi_client.c
 functional_fi_rdm_multi_client_LDADD = libfabtests.la
@@ -652,6 +657,7 @@ dummy_man_pages = \
 	man/man1/fi_getinfo_test.1 \
 	man/man1/fi_mr_test.1 \
 	man/man1/fi_bw.1 \
+	man/man1/fi_flood.1 \
 	man/man1/fi_rdm_multi_client.1 \
 	man/man1/fi_ubertest.1 \
 	man/man1/fi_efa_ep_rnr_retry.1
diff --git a/fabtests/common/shared.c b/fabtests/common/shared.c
index eb95127b6f0..2d01414f29a 100644
--- a/fabtests/common/shared.c
+++ b/fabtests/common/shared.c
@@ -1229,6 +1229,13 @@ int ft_server_connect(void)
 	if (ft_check_opts(FT_OPT_FORK_CHILD))
 		ft_fork_child();
 
+	if (ft_check_opts(FT_OPT_NO_PRE_POSTED_RX) &&
+	    !ft_check_opts(FT_OPT_SKIP_MSG_ALLOC) &&
+	    (fi->caps & (FI_MSG | FI_TAGGED))) {
+		ret = ft_sync_inband(false);
+		if (ret)
+			return ret;
+	}
 	return 0;
 
 err:
@@ -1290,6 +1297,13 @@ int ft_client_connect(void)
 	if (ft_check_opts(FT_OPT_FORK_CHILD))
 		ft_fork_child();
 
+	if (ft_check_opts(FT_OPT_NO_PRE_POSTED_RX) &&
+	    !ft_check_opts(FT_OPT_SKIP_MSG_ALLOC) &&
+	    (fi->caps & (FI_MSG | FI_TAGGED))) {
+		ret = ft_sync_inband(false);
+		if (ret)
+			return ret;
+	}
 	return 0;
 }
 
diff --git a/fabtests/functional/flood.c b/fabtests/functional/flood.c
new file mode 100644
index 00000000000..9c98ddd32c4
--- /dev/null
+++ b/fabtests/functional/flood.c
@@ -0,0 +1,305 @@
+/*
+ * Copyright (c) Intel Corporation.  All rights reserved.
+ *
+ * This software is available to you under the BSD license
+ * below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <unistd.h>
+
+#include <shared.h>
+
+int sleep_time = 0;
+
+static ssize_t post_one_tx(struct ft_context *msg)
+{
+	ssize_t ret;
+
+	if (ft_check_opts(FT_OPT_VERIFY_DATA | FT_OPT_ACTIVE)) {
+		ret = ft_fill_buf(msg->buf + ft_tx_prefix_size(),
+				  opts.transfer_size);
+		if (ret)
+			return ret;
+	}
+
+	return ft_post_tx_buf(ep, remote_fi_addr, opts.transfer_size,
+			      NO_CQ_DATA, &msg->context, msg->buf,
+			      msg->desc, 0);
+}
+
+static ssize_t wait_check_rx_bufs(void)
+{
+	ssize_t ret;
+	int i;
+
+	ret = ft_get_rx_comp(rx_seq);
+	if (ret)
+		return ret;
+
+	if (!ft_check_opts(FT_OPT_VERIFY_DATA | FT_OPT_ACTIVE))
+		return 0;
+
+	for (i = 0; i < opts.window_size; i++) {
+		ret = ft_check_buf((char *) rx_ctx_arr[i].buf +
+				   ft_rx_prefix_size(), opts.transfer_size);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int post_rx_sync(void)
+{
+	int ret;
+
+	ret = ft_post_rx(ep, rx_size, &rx_ctx);
+	if (ret)
+		return ret;
+
+	if (opts.dst_addr) {
+		ret = ft_tx(ep, remote_fi_addr, 1, &tx_ctx);
+		if (ret)
+			return ret;
+
+		ret = ft_get_rx_comp(rx_seq);
+	} else {
+		ret = ft_get_rx_comp(rx_seq);
+		if (ret)
+			return ret;
+
+		ret = ft_tx(ep, remote_fi_addr, 1, &tx_ctx);
+	}
+
+	return ret;
+}
+
+static void mr_close_all(struct ft_context *ctx_arr, int window_size)
+{
+	int i;
+	for (i = 0; i < window_size; i++)
+		FT_CLOSE_FID(ctx_arr[i].mr);
+}
+
+static int run_seq_mr_send(void) {
+
+	int ret;
+	int i;
+
+	mr_close_all(tx_ctx_arr, opts.window_size);
+	mr_close_all(rx_ctx_arr, opts.window_size);
+
+	printf("Sequential memory registration:");
+	if (opts.dst_addr) {
+		for (i = 0; i < opts.window_size; i++) {
+			ret = ft_reg_mr(fi, tx_ctx_arr[i].buf, tx_mr_size,
+					ft_info_to_mr_access(fi),
+					FT_TX_MR_KEY + i, opts.iface, opts.device,
+					&(tx_ctx_arr[i].mr), &(tx_ctx_arr[i].desc));
+			if (ret)
+				goto err;
+
+			if (ft_check_opts(FT_OPT_VERIFY_DATA | FT_OPT_ACTIVE)) {
+				ret = ft_fill_buf(tx_ctx_arr[i].buf + ft_tx_prefix_size(),
+						  opts.transfer_size);
+			if (ret)
+				goto err;
+			}
+
+			ft_post_tx_buf(ep, remote_fi_addr,  opts.transfer_size,
+				       NO_CQ_DATA,  &(tx_ctx_arr[i].context),
+				       tx_ctx_arr[i].buf, tx_ctx_arr[i].desc,
+				       ft_tag);
+			ret = ft_get_tx_comp(tx_seq);
+			if (ret)
+				goto err;
+			FT_CLOSE_FID(tx_ctx_arr[i].mr);
+		}
+	}
+	else {
+		for (i = 0; i < opts.window_size; i++) {
+			ret = ft_reg_mr(fi, rx_ctx_arr[i].buf, rx_mr_size,
+					ft_info_to_mr_access(fi), FT_RX_MR_KEY + i,
+					opts.iface, opts.device, &(rx_ctx_arr[i].mr),
+					&(rx_ctx_arr[i].desc));
+			if (ret)
+				goto err;
+
+			ft_post_rx_buf(ep, opts.transfer_size,
+				       &(rx_ctx_arr[i].context), rx_ctx_arr[i].buf,
+				       rx_ctx_arr[i].desc, ft_tag);
+			ret = wait_check_rx_bufs();
+			if (ret)
+				goto err;
+			FT_CLOSE_FID(rx_ctx_arr[i].mr);
+		}
+	}
+	if (opts.options & FT_OPT_OOB_SYNC)
+		ret = ft_sync();
+	else
+		ret = post_rx_sync();
+err:
+	printf("%s\n", ret ? "Fail" : "Pass");	
+	return ret;
+}
+
+static int run_batch_mr_send(void)
+{
+	int ret, i;
+
+	/* Receive side delay is used in order to let the sender
+	   get ahead of the receiver and post multiple sends
+	   before the receiver begins processing them. */
+	if (!opts.dst_addr)
+		sleep(sleep_time);
+
+	printf("Batch memory registration:");
+	if (opts.dst_addr) {
+		for (i = 0; i < opts.window_size; i++) {
+			ret = post_one_tx(&tx_ctx_arr[i]);
+			if (ret)
+				goto err;
+		}
+
+		ret = ft_get_tx_comp(tx_seq);
+		if (ret)
+			goto err;
+	} else {
+		for (i = 0; i < opts.window_size; i++) {
+			ret = ft_post_rx_buf(ep, opts.transfer_size,
+					     &rx_ctx_arr[i].context,
+					     rx_ctx_arr[i].buf,
+					     rx_ctx_arr[i].desc, 0);
+			if (ret)
+				goto err;
+		}
+
+		ret = wait_check_rx_bufs();
+		if (ret)
+			goto err;
+	}
+
+	if (opts.options & FT_OPT_OOB_SYNC)
+		ret = ft_sync();
+	else
+		ret = post_rx_sync();
+err:
+	printf("%s\n", ret ? "Fail" : "Pass");	
+	return ret;
+}
+
+static int run(void)
+{
+	int ret;
+
+	ret = hints->ep_attr->type == FI_EP_MSG ?
+		ft_init_fabric_cm() : ft_init_fabric();
+	if (ret)
+		return ret;
+
+	ret = run_batch_mr_send();
+	if (ret)
+		goto out;
+
+	ret = run_seq_mr_send();
+	if (ret)
+		goto out;
+
+out:
+	return ret;
+}
+
+int main(int argc, char **argv)
+{
+	int op, ret;
+
+	opts = INIT_OPTS;
+
+	hints = fi_allocinfo();
+	if (!hints)
+		return EXIT_FAILURE;
+
+	hints->ep_attr->type = FI_EP_RDM;
+
+	while ((op = getopt(argc, argv, "UW:vT:h" CS_OPTS ADDR_OPTS INFO_OPTS)) != -1) {
+		switch (op) {
+		default:
+			ft_parse_addr_opts(op, optarg, &opts);
+			ft_parseinfo(op, optarg, hints, &opts);
+			ft_parsecsopts(op, optarg, &opts);
+			break;
+		case 'W':
+			opts.window_size = atoi(optarg);
+			break;
+		case 'U':
+			hints->tx_attr->op_flags |= FI_DELIVERY_COMPLETE;
+			break;
+		case 'v':
+			opts.options |= FT_OPT_VERIFY_DATA;
+			break;
+		case 'T':
+			sleep_time = atoi(optarg);
+			break;
+		case '?':
+		case 'h':
+			ft_usage(argv[0], "test to oversubscribe mr cache and receiver with unexpected msgs.");
+			FT_PRINT_OPTS_USAGE("-T sleep_time",
+				"Receive side delay before starting");
+			FT_PRINT_OPTS_USAGE("-v", "Enable data verification");
+			FT_PRINT_OPTS_USAGE("-W window_size",
+				"Set transmit window size before waiting for completion");
+			return EXIT_FAILURE;
+		}
+	}
+
+	if (optind < argc)
+		opts.dst_addr = argv[optind];
+
+	hints->caps = FI_MSG;
+	hints->mode = FI_CONTEXT;
+	hints->domain_attr->mr_mode = opts.mr_mode;
+	hints->addr_format = opts.address_format;
+
+	opts.options |= FT_OPT_ALLOC_MULT_MR;
+	opts.options |= FT_OPT_NO_PRE_POSTED_RX;
+	if (hints->ep_attr->type == FI_EP_DGRAM) {
+		fprintf(stderr, "This test does not support DGRAM endpoints\n");
+		return -FI_EINVAL;
+	}
+
+	if (opts.options & FT_OPT_VERIFY_DATA) {
+		hints->tx_attr->msg_order |= FI_ORDER_SAS;
+		hints->rx_attr->msg_order |= FI_ORDER_SAS;
+	}
+
+	ret = run();
+	
+	ft_free_res();
+
+	return ft_exit_code(ret);
+}
\ No newline at end of file
diff --git a/fabtests/man/man1/fi_flood.1 b/fabtests/man/man1/fi_flood.1
new file mode 100644
index 00000000000..2d5fda814d2
--- /dev/null
+++ b/fabtests/man/man1/fi_flood.1
@@ -0,0 +1 @@
+.so man7/fabtests.7 
diff --git a/fabtests/scripts/runfabtests.sh b/fabtests/scripts/runfabtests.sh
index 8b402aa38e1..2c7f984a902 100755
--- a/fabtests/scripts/runfabtests.sh
+++ b/fabtests/scripts/runfabtests.sh
@@ -150,9 +150,9 @@ functional_tests=(
 	"fi_inject_test -N -A inject -v"
 	"fi_inject_test -A inj_complete -v"
 	"fi_inject_test -N -A inj_complete -v"
-	"fi_bw -e rdm -v -T 1"
-	"fi_bw -e rdm -v -T 1 -U"
-	"fi_bw -e msg -v -T 1"
+	"fi_flood -e rdm -v -T 1"
+	"fi_flood -e rdm -v -T 1 -U"
+	"fi_flood -e msg -v -T 1"
 	"fi_rdm_multi_client -C 10 -I 5"
 	"fi_rdm_multi_client -C 10 -I 5 -U"
 )