[dpdk-stable] [PATCH v2] examples/multi_process: fix buffer underrun

[Yongseok Koh]

> On Apr 10, 2019, at 12:41 PM, Yongseok Koh <yskoh at mellanox.com> wrote:
> 
> For client_server_mp, the total number of buffers for the mbuf mempool
> should be correctly calculated. Otherwise, having more clients will stop
> traffic.
> 
> Fixes: af75078fece3 ("first public release")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Yongseok Koh <yskoh at mellanox.com>
> ---
> 
> v2:
> * split up the calculation

Sorry, I forgot to specify 'v2' in the title of this email.


Thanks,
Yongseok

> examples/multi_process/client_server_mp/mp_server/init.c | 13 +++++++++----
> 1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/examples/multi_process/client_server_mp/mp_server/init.c b/examples/multi_process/client_server_mp/mp_server/init.c
> index 30c8e44bc0..3af5dc6994 100644
> --- a/examples/multi_process/client_server_mp/mp_server/init.c
> +++ b/examples/multi_process/client_server_mp/mp_server/init.c
> @@ -37,8 +37,6 @@
> #include "args.h"
> #include "init.h"
> 
> -#define MBUFS_PER_CLIENT 1536
> -#define MBUFS_PER_PORT 1536
> #define MBUF_CACHE_SIZE 512
> 
> #define RTE_MP_RX_DESC_DEFAULT 1024
> @@ -63,8 +61,15 @@ struct port_info *ports;
> static int
> init_mbuf_pools(void)
> {
> -	const unsigned num_mbufs = (num_clients * MBUFS_PER_CLIENT) \
> -			+ (ports->num_ports * MBUFS_PER_PORT);
> +	const unsigned int num_mbufs_server =
> +		RTE_MP_RX_DESC_DEFAULT * ports->num_ports;
> +	const unsigned int num_mbufs_client =
> +		num_clients * (CLIENT_QUEUE_RINGSIZE +
> +			       RTE_MP_TX_DESC_DEFAULT * ports->num_ports);
> +	const unsigned int num_mbufs_mp_cache =
> +		(num_clients + 1) * MBUF_CACHE_SIZE;
> +	const unsigned int num_mbufs =
> +		num_mbufs_server + num_mbufs_client + num_mbufs_mp_cache;
> 
> 	/* don't pass single-producer/single-consumer flags to mbuf create as it
> 	 * seems faster to use a cache instead */
> -- 
> 2.11.0
>