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

["Jiang, MaoX" <maox.jiang@intel.com>]

Tested-by:xix.zhang@intel.com

Best regards,
Jiang Mao

> -----Original Message-----
> From: stable [mailto:stable-bounces@dpdk.org] On Behalf Of Louise
> Kilheeney
> Sent: Wednesday, March 11, 2020 8:05 PM
> To: dev@dpdk.org
> Cc: Kilheeney, Louise <louise.kilheeney@intel.com>; stable@dpdk.org
> Subject: [dpdk-stable] [PATCH] 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>
> ---
>  examples/l2fwd-keepalive/main.c | 17 ++++++++++-------
>  1 file changed, 10 insertions(+), 7 deletions(-)
> 
> diff --git a/examples/l2fwd-keepalive/main.c b/examples/l2fwd-
> keepalive/main.c index b36834974..0f0010d51 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 */ @@ -561,16
> +561,19 @@ 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 */
> +	unsigned int 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