diff --git a/test/test/test_hash_readwrite.c b/test/test/test_hash_readwrite.c
index 2a4f7b9..1cb00ad 100644
--- a/test/test/test_hash_readwrite.c
+++ b/test/test/test_hash_readwrite.c
@@ -21,6 +21,8 @@
 #define TOTAL_ENTRY (16*1024*1024)
 #define TOTAL_INSERT (15*1024*1024)
 
+#define TOTAL_INSERT_EXT (16*1024*1024)
+
 #define NUM_TEST 3
 unsigned int core_cnt[NUM_TEST] = {2, 4, 8};
 
@@ -59,8 +61,10 @@ test_hash_readwrite_worker(__attribute__((unused)) void *arg)
 	uint64_t i, offset;
 	uint32_t lcore_id = rte_lcore_id();
 	uint64_t begin, cycles;
-	int ret;
+	int *ret;
 
+	ret = rte_malloc(NULL, sizeof(int) *
+				tbl_rw_test_param.num_insert, 0);
 	for (i = 0; i < rte_lcore_count(); i++) {
 		if (slave_core_ids[i] == lcore_id)
 			break;
@@ -79,13 +83,30 @@ test_hash_readwrite_worker(__attribute__((unused)) void *arg)
 				tbl_rw_test_param.keys + i) > 0)
 			break;
 
-		ret = rte_hash_add_key(tbl_rw_test_param.h,
+		ret[i - offset] = rte_hash_add_key(tbl_rw_test_param.h,
 				     tbl_rw_test_param.keys + i);
-		if (ret < 0)
+		if (ret[i - offset] < 0)
+			break;
+
+		/* lookup a random key */
+		uint32_t rand = rte_rand() % (i + 1 - offset);
+
+		if (rte_hash_lookup(tbl_rw_test_param.h,
+				tbl_rw_test_param.keys + rand) != ret[rand])
+			break;
+
+
+		if (rte_hash_del_key(tbl_rw_test_param.h,
+				tbl_rw_test_param.keys + rand) != ret[rand])
+			break;
+
+		ret[rand] = rte_hash_add_key(tbl_rw_test_param.h,
+					tbl_rw_test_param.keys + rand);
+		if (ret[rand] < 0)
 			break;
 
 		if (rte_hash_lookup(tbl_rw_test_param.h,
-				tbl_rw_test_param.keys + i) != ret)
+			tbl_rw_test_param.keys + rand) != ret[rand])
 			break;
 	}
 
@@ -100,7 +121,7 @@ test_hash_readwrite_worker(__attribute__((unused)) void *arg)
 }
 
 static int
-init_params(int use_htm, int use_jhash)
+init_params(int use_ext, int use_htm, int use_jhash)
 {
 	unsigned int i;
 
@@ -127,6 +148,13 @@ init_params(int use_htm, int use_jhash)
 		hash_params.extra_flag =
 			RTE_HASH_EXTRA_FLAGS_RW_CONCURRENCY;
 
+	if (use_ext)
+		hash_params.extra_flag |=
+			RTE_HASH_EXTRA_FLAGS_EXT_TABLE;
+	else
+		hash_params.extra_flag &=
+		       ~RTE_HASH_EXTRA_FLAGS_EXT_TABLE;
+
 	hash_params.name = "tests";
 
 	handle = rte_hash_create(&hash_params);
@@ -165,7 +193,7 @@ init_params(int use_htm, int use_jhash)
 }
 
 static int
-test_hash_readwrite_functional(int use_htm)
+test_hash_readwrite_functional(int use_ext, int use_htm)
 {
 	unsigned int i;
 	const void *next_key;
@@ -176,6 +204,7 @@ test_hash_readwrite_functional(int use_htm)
 	uint32_t lost_keys = 0;
 	int use_jhash = 1;
 	int slave_cnt = rte_lcore_count() - 1;
+	uint32_t tot_insert = 0;
 
 	rte_atomic64_init(&gcycles);
 	rte_atomic64_clear(&gcycles);
@@ -183,11 +212,16 @@ test_hash_readwrite_functional(int use_htm)
 	rte_atomic64_init(&ginsertions);
 	rte_atomic64_clear(&ginsertions);
 
-	if (init_params(use_htm, use_jhash) != 0)
+	if (init_params(use_ext, use_htm, use_jhash) != 0)
 		goto err;
 
+	if (use_ext)
+		tot_insert = TOTAL_INSERT_EXT;
+	else
+		tot_insert = TOTAL_INSERT;
+
 	tbl_rw_test_param.num_insert =
-		TOTAL_INSERT / slave_cnt;
+		tot_insert / slave_cnt;
 
 	tbl_rw_test_param.rounded_tot_insert =
 		tbl_rw_test_param.num_insert
@@ -343,7 +377,7 @@ test_hash_readwrite_perf(struct perf *perf_results, int use_htm,
 	rte_atomic64_init(&gwrite_cycles);
 	rte_atomic64_clear(&gwrite_cycles);
 
-	if (init_params(use_htm, use_jhash) != 0)
+	if (init_params(0, use_htm, use_jhash) != 0)
 		goto err;
 
 	/*
@@ -577,7 +611,7 @@ test_hash_readwrite_main(void)
 	 * than writer threads. This is to timing either reader threads or
 	 * writer threads for performance numbers.
 	 */
-	int use_htm, reader_faster;
+	int use_htm, use_ext,  reader_faster;
 	unsigned int i = 0, core_id = 0;
 
 	if (rte_lcore_count() <= 2) {
@@ -600,7 +634,13 @@ test_hash_readwrite_main(void)
 		printf("Test read-write with Hardware transactional memory\n");
 
 		use_htm = 1;
-		if (test_hash_readwrite_functional(use_htm) < 0)
+		use_ext = 0;
+
+		if (test_hash_readwrite_functional(use_ext, use_htm) < 0)
+			return -1;
+
+		use_ext = 1;
+		if (test_hash_readwrite_functional(use_ext, use_htm) < 0)
 			return -1;
 
 		reader_faster = 1;
@@ -619,8 +659,14 @@ test_hash_readwrite_main(void)
 
 	printf("Test read-write without Hardware transactional memory\n");
 	use_htm = 0;
-	if (test_hash_readwrite_functional(use_htm) < 0)
+	use_ext = 0;
+	if (test_hash_readwrite_functional(use_ext, use_htm) < 0)
 		return -1;
+
+	use_ext = 1;
+	if (test_hash_readwrite_functional(use_ext, use_htm) < 0)
+		return -1;
+
 	reader_faster = 1;
 	if (test_hash_readwrite_perf(&non_htm_results, use_htm,
 							reader_faster) < 0)
