Re: [dpdk-dev] [PATCH] examples/l3fwd: support separate buffer pool per port

["Ruifeng Wang (Arm Technology China)" <Ruifeng.Wang@arm.com>]

Hi Shreyansh,

I tried this patch on MacchiatoBin + 82599 NIC.
Compared with global-pool mode, per-port-pool mode showed slightly lower performance in single core test.
In dual core test, both modes had nearly same performance. 

My setup only has two ports which is limited. 
Just want to know the per-port-pool mode has more performance gain when many ports are bound to  different cores?

Used commands:
sudo ./examples/l3fwd/build/l3fwd -c 0x4 -w 0000:01:00.0 -w 0000:01:00.1 -- -P -p 3 --config='(0,0,2),(1,0,2)' --per-port-pool
sudo ./examples/l3fwd/build/l3fwd -c 0xc -w 0000:01:00.0 -w 0000:01:00.1 -- -P -p 3 --config='(0,0,2),(1,0,3)' --per-port-pool

Regards,
/Ruifeng

> -----Original Message-----
> From: dev <dev-bounces@dpdk.org> On Behalf Of Shreyansh Jain
> Sent: 2019年1月3日 19:30
> To: dev@dpdk.org
> Cc: Shreyansh Jain <shreyansh.jain@nxp.com>
> Subject: [dpdk-dev] [PATCH] examples/l3fwd: support separate buffer pool
> per port
> 
> Traditionally, only a single buffer pool per port (or, per-port-per-socket) is
> created in l3fwd application.
> 
> If separate pools are created per-port, it might lead to gain in performance as
> packet alloc/dealloc requests would be isolated across ports (and their
> corresponding lcores).
> 
> This patch adds an argument '--per-port-pool' to the l3fwd application.
> By default, old mode of single pool per port (split on sockets) is active.
> 
> Signed-off-by: Shreyansh Jain <shreyansh.jain@nxp.com>
> ---
> 
> RFC: https://mails.dpdk.org/archives/dev/2018-November/120002.html
> 
>  examples/l3fwd/main.c | 74 +++++++++++++++++++++++++++++++--------
> ----
>  1 file changed, 53 insertions(+), 21 deletions(-)
> 
> diff --git a/examples/l3fwd/main.c b/examples/l3fwd/main.c index
> e4b99efe0..7b9683187 100644
> --- a/examples/l3fwd/main.c
> +++ b/examples/l3fwd/main.c
> @@ -69,11 +69,13 @@ static int promiscuous_on;  static int l3fwd_lpm_on;
> static int l3fwd_em_on;
> 
> +/* Global variables. */
> +
>  static int numa_on = 1; /**< NUMA is enabled by default. */  static int
> parse_ptype; /**< Parse packet type using rx callback, and */
>  			/**< disabled by default */
> -
> -/* Global variables. */
> +static int per_port_pool; /**< Use separate buffer pools per port; disabled
> */
> +			  /**< by default */
> 
>  volatile bool force_quit;
> 
> @@ -133,7 +135,8 @@ static struct rte_eth_conf port_conf = {
>  	},
>  };
> 
> -static struct rte_mempool * pktmbuf_pool[NB_SOCKETS];
> +static struct rte_mempool
> *pktmbuf_pool[RTE_MAX_ETHPORTS][NB_SOCKETS];
> +static uint8_t lkp_per_socket[NB_SOCKETS];
> 
>  struct l3fwd_lkp_mode {
>  	void  (*setup)(int);
> @@ -285,7 +288,8 @@ print_usage(const char *prgname)
>  		" [--no-numa]"
>  		" [--hash-entry-num]"
>  		" [--ipv6]"
> -		" [--parse-ptype]\n\n"
> +		" [--parse-ptype]"
> +		" [--per-port-pool]\n\n"
> 
>  		"  -p PORTMASK: Hexadecimal bitmask of ports to
> configure\n"
>  		"  -P : Enable promiscuous mode\n"
> @@ -299,7 +303,8 @@ print_usage(const char *prgname)
>  		"  --no-numa: Disable numa awareness\n"
>  		"  --hash-entry-num: Specify the hash entry number in
> hexadecimal to be setup\n"
>  		"  --ipv6: Set if running ipv6 packets\n"
> -		"  --parse-ptype: Set to use software to analyze packet
> type\n\n",
> +		"  --parse-ptype: Set to use software to analyze packet
> type\n"
> +		"  --per-port-pool: Use separate buffer pool per port\n\n",
>  		prgname);
>  }
> 
> @@ -452,6 +457,7 @@ static const char short_options[] =  #define
> CMD_LINE_OPT_ENABLE_JUMBO "enable-jumbo"
>  #define CMD_LINE_OPT_HASH_ENTRY_NUM "hash-entry-num"
>  #define CMD_LINE_OPT_PARSE_PTYPE "parse-ptype"
> +#define CMD_LINE_OPT_PER_PORT_POOL "per-port-pool"
>  enum {
>  	/* long options mapped to a short option */
> 
> @@ -465,6 +471,7 @@ enum {
>  	CMD_LINE_OPT_ENABLE_JUMBO_NUM,
>  	CMD_LINE_OPT_HASH_ENTRY_NUM_NUM,
>  	CMD_LINE_OPT_PARSE_PTYPE_NUM,
> +	CMD_LINE_OPT_PARSE_PER_PORT_POOL,
>  };
> 
>  static const struct option lgopts[] = { @@ -475,6 +482,7 @@ static const
> struct option lgopts[] = {
>  	{CMD_LINE_OPT_ENABLE_JUMBO, 0, 0,
> CMD_LINE_OPT_ENABLE_JUMBO_NUM},
>  	{CMD_LINE_OPT_HASH_ENTRY_NUM, 1, 0,
> CMD_LINE_OPT_HASH_ENTRY_NUM_NUM},
>  	{CMD_LINE_OPT_PARSE_PTYPE, 0, 0,
> CMD_LINE_OPT_PARSE_PTYPE_NUM},
> +	{CMD_LINE_OPT_PER_PORT_POOL, 0, 0,
> CMD_LINE_OPT_PARSE_PER_PORT_POOL},
>  	{NULL, 0, 0, 0}
>  };
> 
> @@ -485,10 +493,10 @@ static const struct option lgopts[] = {
>   * RTE_MAX is used to ensure that NB_MBUF never goes below a minimum
>   * value of 8192
>   */
> -#define NB_MBUF RTE_MAX(	\
> -	(nb_ports*nb_rx_queue*nb_rxd +		\
> -	nb_ports*nb_lcores*MAX_PKT_BURST +	\
> -	nb_ports*n_tx_queue*nb_txd +		\
> +#define NB_MBUF(nports) RTE_MAX(	\
> +	(nports*nb_rx_queue*nb_rxd +		\
> +	nports*nb_lcores*MAX_PKT_BURST +	\
> +	nports*n_tx_queue*nb_txd +		\
>  	nb_lcores*MEMPOOL_CACHE_SIZE),		\
>  	(unsigned)8192)
> 
> @@ -594,6 +602,11 @@ parse_args(int argc, char **argv)
>  			parse_ptype = 1;
>  			break;
> 
> +		case CMD_LINE_OPT_PARSE_PER_PORT_POOL:
> +			printf("per port buffer pool is enabled\n");
> +			per_port_pool = 1;
> +			break;
> +
>  		default:
>  			print_usage(prgname);
>  			return -1;
> @@ -642,7 +655,7 @@ print_ethaddr(const char *name, const struct
> ether_addr *eth_addr)  }
> 
>  static int
> -init_mem(unsigned nb_mbuf)
> +init_mem(uint16_t portid, unsigned int nb_mbuf)
>  {
>  	struct lcore_conf *qconf;
>  	int socketid;
> @@ -664,13 +677,14 @@ init_mem(unsigned nb_mbuf)
>  				socketid, lcore_id, NB_SOCKETS);
>  		}
> 
> -		if (pktmbuf_pool[socketid] == NULL) {
> -			snprintf(s, sizeof(s), "mbuf_pool_%d", socketid);
> -			pktmbuf_pool[socketid] =
> +		if (pktmbuf_pool[portid][socketid] == NULL) {
> +			snprintf(s, sizeof(s), "mbuf_pool_%d:%d",
> +				 portid, socketid);
> +			pktmbuf_pool[portid][socketid] =
>  				rte_pktmbuf_pool_create(s, nb_mbuf,
>  					MEMPOOL_CACHE_SIZE, 0,
>  					RTE_MBUF_DEFAULT_BUF_SIZE,
> socketid);
> -			if (pktmbuf_pool[socketid] == NULL)
> +			if (pktmbuf_pool[portid][socketid] == NULL)
>  				rte_exit(EXIT_FAILURE,
>  					"Cannot init mbuf pool on
> socket %d\n",
>  					socketid);
> @@ -678,8 +692,13 @@ init_mem(unsigned nb_mbuf)
>  				printf("Allocated mbuf pool on socket %d\n",
>  					socketid);
> 
> -			/* Setup either LPM or EM(f.e Hash).  */
> -			l3fwd_lkp.setup(socketid);
> +			/* Setup either LPM or EM(f.e Hash). But, only once
> per
> +			 * available socket.
> +			 */
> +			if (!lkp_per_socket[socketid]) {
> +				l3fwd_lkp.setup(socketid);
> +				lkp_per_socket[socketid] = 1;
> +			}
>  		}
>  		qconf = &lcore_conf[lcore_id];
>  		qconf->ipv4_lookup_struct =
> @@ -899,7 +918,14 @@ main(int argc, char **argv)
>  			(struct ether_addr *)(val_eth + portid) + 1);
> 
>  		/* init memory */
> -		ret = init_mem(NB_MBUF);
> +		if (!per_port_pool) {
> +			/* portid = 0; this is *not* signifying the first port,
> +			 * rather, it signifies that portid is ignored.
> +			 */
> +			ret = init_mem(0, NB_MBUF(nb_ports));
> +		} else {
> +			ret = init_mem(portid, NB_MBUF(1));
> +		}
>  		if (ret < 0)
>  			rte_exit(EXIT_FAILURE, "init_mem failed\n");
> 
> @@ -966,10 +992,16 @@ main(int argc, char **argv)
>  			rte_eth_dev_info_get(portid, &dev_info);
>  			rxq_conf = dev_info.default_rxconf;
>  			rxq_conf.offloads = conf->rxmode.offloads;
> -			ret = rte_eth_rx_queue_setup(portid, queueid,
> nb_rxd,
> -					socketid,
> -					&rxq_conf,
> -					pktmbuf_pool[socketid]);
> +			if (!per_port_pool)
> +				ret = rte_eth_rx_queue_setup(portid,
> queueid,
> +						nb_rxd, socketid,
> +						&rxq_conf,
> +						pktmbuf_pool[0][socketid]);
> +			else
> +				ret = rte_eth_rx_queue_setup(portid,
> queueid,
> +						nb_rxd, socketid,
> +						&rxq_conf,
> +
> 	pktmbuf_pool[portid][socketid]);
>  			if (ret < 0)
>  				rte_exit(EXIT_FAILURE,
>  				"rte_eth_rx_queue_setup: err=%d,
> port=%d\n",
> --
> 2.17.1