Re: [dpdk-dev] [PATCH v2] examples/l2fwd-keepalive: fix packet drops limited mbufs

["Xie, WeiX" <weix.xie@intel.com>]

Tested-by:zhang,xi <xix.zhang@intel.com>

Regards,
Xie Wei


-----Original Message-----
From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Louise Kilheeney
Sent: Monday, April 27, 2020 10:58 PM
To: dev@dpdk.org
Cc: Kilheeney, Louise <louise.kilheeney@intel.com>; stable@dpdk.org
Subject: [dpdk-dev] [PATCH v2] examples/l2fwd-keepalive: fix packet drops limited mbufs

MBUF pool of size 8192 was causing packet loss when using four ports. To fix this issue this patch specifies the number of MBUF's per port instead of having one set MBUF pool size, this way it will adapt to any number of ports.

Fixes: e64833f2273a ("examples/l2fwd-keepalive: add sample application")
Cc: stable@dpdk.org

Signed-off-by: Louise Kilheeney <louise.kilheeney@intel.com>
Tested-by: Xi Zhang <xix.zhang@intel.com>

---
v2: moved variable initialisation to top of function.
---
 examples/l2fwd-keepalive/main.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/examples/l2fwd-keepalive/main.c b/examples/l2fwd-keepalive/main.c index 2ae5a3c6a..32482158d 100644
--- a/examples/l2fwd-keepalive/main.c
+++ b/examples/l2fwd-keepalive/main.c
@@ -44,7 +44,7 @@
 
 #define RTE_LOGTYPE_L2FWD RTE_LOGTYPE_USER1
 
-#define NB_MBUF   8192
+#define NB_MBUF_PER_PORT 3000
 
 #define MAX_PKT_BURST 32
 #define BURST_TX_DRAIN_US 100 /* TX drain every ~100us */ @@ -536,6 +536,7 @@ main(int argc, char **argv)
 	uint16_t portid, last_port;
 	unsigned lcore_id, rx_lcore_id;
 	unsigned nb_ports_in_mask = 0;
+	unsigned int total_nb_mbufs;
 	struct sigaction signal_handler;
 	struct rte_keepalive_shm *ka_shm;
 
@@ -561,16 +562,19 @@ main(int argc, char **argv)
 	if (ret < 0)
 		rte_exit(EXIT_FAILURE, "Invalid L2FWD arguments\n");
 
-	/* create the mbuf pool */
-	l2fwd_pktmbuf_pool = rte_pktmbuf_pool_create("mbuf_pool", NB_MBUF, 32,
-		0, RTE_MBUF_DEFAULT_BUF_SIZE, rte_socket_id());
-	if (l2fwd_pktmbuf_pool == NULL)
-		rte_exit(EXIT_FAILURE, "Cannot init mbuf pool\n");
-
 	nb_ports = rte_eth_dev_count_avail();
 	if (nb_ports == 0)
 		rte_exit(EXIT_FAILURE, "No Ethernet ports - bye\n");
 
+	/* create the mbuf pool */
+	total_nb_mbufs = NB_MBUF_PER_PORT * nb_ports;
+
+	l2fwd_pktmbuf_pool = rte_pktmbuf_pool_create("mbuf_pool",
+		total_nb_mbufs,	32, 0, RTE_MBUF_DEFAULT_BUF_SIZE,
+		rte_socket_id());
+	if (l2fwd_pktmbuf_pool == NULL)
+		rte_exit(EXIT_FAILURE, "Cannot init mbuf pool\n");
+
 	/* reset l2fwd_dst_ports */
 	for (portid = 0; portid < RTE_MAX_ETHPORTS; portid++)
 		l2fwd_dst_ports[portid] = 0;
--
2.17.1