diff --git a/config/common_base b/config/common_base
index 439f3cc..12b71e9 100644
--- a/config/common_base
+++ b/config/common_base
@@ -220,7 +220,7 @@ CONFIG_RTE_LIBRTE_MLX4_TX_MP_CACHE=8
 #
 # Compile burst-oriented Mellanox ConnectX-4 & ConnectX-5 (MLX5) PMD
 #
-CONFIG_RTE_LIBRTE_MLX5_PMD=n
+CONFIG_RTE_LIBRTE_MLX5_PMD=y
 CONFIG_RTE_LIBRTE_MLX5_DEBUG=n
 CONFIG_RTE_LIBRTE_MLX5_TX_MP_CACHE=8

diff --git a/examples/load_balancer/runtime.c b/examples/load_balancer/runtime.c
index e54b785..d448100 100644
--- a/examples/load_balancer/runtime.c
+++ b/examples/load_balancer/runtime.c
@@ -41,6 +41,7 @@
 #include <stdarg.h>
 #include <errno.h>
 #include <getopt.h>
+#include <unistd.h>

 #include <rte_common.h>
 #include <rte_byteorder.h>
@@ -133,6 +134,8 @@ app_lcore_io_rx_buffer_to_send (
 	uint32_t pos;
 	int ret;

+	rte_pktmbuf_refcnt_update(mbuf, 1);
+
 	pos = lp->rx.mbuf_out[worker].n_mbufs;
 	lp->rx.mbuf_out[worker].array[pos ++] = mbuf;
 	if (likely(pos < bsz)) {
@@ -521,6 +524,8 @@ app_lcore_worker(
 		continue;
 #endif

+		usleep(20);
+
 		APP_WORKER_PREFETCH1(rte_pktmbuf_mtod(lp->mbuf_in.array[0], unsigned char *));
 		APP_WORKER_PREFETCH0(lp->mbuf_in.array[1]);

@@ -530,6 +535,8 @@ app_lcore_worker(
 			uint32_t ipv4_dst, pos;
 			uint32_t port;

+			rte_pktmbuf_free(lp->mbuf_in.array[j]);
+
 			if (likely(j < bsz_rd - 1)) {
 				APP_WORKER_PREFETCH1(rte_pktmbuf_mtod(lp->mbuf_in.array[j+1], unsigned char *));
 			}