[dpdk-dev] [PATCH] app/testpmd: reduce memory consumption

[David Marchand]

Following [1], testpmd memory consumption has skyrocketted.
The rte_port structure has gotten quite fat.

struct rte_port {
[...]
  struct rte_eth_rxconf rx_conf[65536];            /* 266280 3145728 */
  /* --- cacheline 53312 boundary (3411968 bytes) was 40 bytes ago --- */
  struct rte_eth_txconf tx_conf[65536];            /* 3412008 3670016 */
  /* --- cacheline 110656 boundary (7081984 bytes) was 40 bytes ago --- */
[...]
  /* size: 8654936, cachelines: 135234, members: 31 */
[...]

testpmd handles RTE_MAX_ETHPORTS ports (32 by default) which means that it
needs ~256MB just for this internal representation.

The reason is that a testpmd rte_port (the name is quite confusing, as
it is a local type) maintains configurations for all queues of a port.
But where you would expect testpmd to use RTE_MAX_QUEUES_PER_PORT as the
maximum queue count, the rte_port uses MAX_QUEUE_ID set to 64k.

Prefer the ethdev maximum value.

After this patch:
struct rte_port {
[...]
  struct rte_eth_rxconf      rx_conf[1025];        /*  8240 49200 */
  /* --- cacheline 897 boundary (57408 bytes) was 32 bytes ago --- */
  struct rte_eth_txconf      tx_conf[1025];        /* 57440 57400 */
  /* --- cacheline 1794 boundary (114816 bytes) was 24 bytes ago --- */
[...]
  /* size: 139488, cachelines: 2180, members: 31 */
[...]

[1]: https://git.dpdk.org/dpdk/commit/?id=436b3a6b6e62

Signed-off-by: David Marchand <david.marchand at redhat.com>
---
 app/test-pmd/testpmd.c |  6 +++---
 app/test-pmd/testpmd.h | 16 +++++++---------
 2 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index 73ebf37aae..d28211ba52 100644
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -979,7 +979,7 @@ check_socket_id(const unsigned int socket_id)
 queueid_t
 get_allowed_max_nb_rxq(portid_t *pid)
 {
-	queueid_t allowed_max_rxq = MAX_QUEUE_ID;
+	queueid_t allowed_max_rxq = RTE_MAX_QUEUES_PER_PORT;
 	bool max_rxq_valid = false;
 	portid_t pi;
 	struct rte_eth_dev_info dev_info;
@@ -1029,7 +1029,7 @@ check_nb_rxq(queueid_t rxq)
 queueid_t
 get_allowed_max_nb_txq(portid_t *pid)
 {
-	queueid_t allowed_max_txq = MAX_QUEUE_ID;
+	queueid_t allowed_max_txq = RTE_MAX_QUEUES_PER_PORT;
 	bool max_txq_valid = false;
 	portid_t pi;
 	struct rte_eth_dev_info dev_info;
@@ -1079,7 +1079,7 @@ check_nb_txq(queueid_t txq)
 queueid_t
 get_allowed_max_nb_hairpinq(portid_t *pid)
 {
-	queueid_t allowed_max_hairpinq = MAX_QUEUE_ID;
+	queueid_t allowed_max_hairpinq = RTE_MAX_QUEUES_PER_PORT;
 	portid_t pi;
 	struct rte_eth_hairpin_cap cap;
 
diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h
index 90694a3309..217d577018 100644
--- a/app/test-pmd/testpmd.h
+++ b/app/test-pmd/testpmd.h
@@ -58,8 +58,6 @@ typedef uint16_t portid_t;
 typedef uint16_t queueid_t;
 typedef uint16_t streamid_t;
 
-#define MAX_QUEUE_ID ((1 << (sizeof(queueid_t) * 8)) - 1)
-
 #if defined RTE_LIBRTE_PMD_SOFTNIC
 #define SOFTNIC			1
 #else
@@ -179,22 +177,22 @@ struct rte_port {
 	uint8_t                 need_reconfig_queues; /**< need reconfiguring queues or not */
 	uint8_t                 rss_flag;   /**< enable rss or not */
 	uint8_t                 dcb_flag;   /**< enable dcb */
-	uint16_t                nb_rx_desc[MAX_QUEUE_ID+1]; /**< per queue rx desc number */
-	uint16_t                nb_tx_desc[MAX_QUEUE_ID+1]; /**< per queue tx desc number */
-	struct rte_eth_rxconf   rx_conf[MAX_QUEUE_ID+1]; /**< per queue rx configuration */
-	struct rte_eth_txconf   tx_conf[MAX_QUEUE_ID+1]; /**< per queue tx configuration */
+	uint16_t                nb_rx_desc[RTE_MAX_QUEUES_PER_PORT+1]; /**< per queue rx desc number */
+	uint16_t                nb_tx_desc[RTE_MAX_QUEUES_PER_PORT+1]; /**< per queue tx desc number */
+	struct rte_eth_rxconf   rx_conf[RTE_MAX_QUEUES_PER_PORT+1]; /**< per queue rx configuration */
+	struct rte_eth_txconf   tx_conf[RTE_MAX_QUEUES_PER_PORT+1]; /**< per queue tx configuration */
 	struct rte_ether_addr   *mc_addr_pool; /**< pool of multicast addrs */
 	uint32_t                mc_addr_nb; /**< nb. of addr. in mc_addr_pool */
 	uint8_t                 slave_flag; /**< bonding slave port */
 	struct port_flow        *flow_list; /**< Associated flows. */
-	const struct rte_eth_rxtx_callback *rx_dump_cb[MAX_QUEUE_ID+1];
-	const struct rte_eth_rxtx_callback *tx_dump_cb[MAX_QUEUE_ID+1];
+	const struct rte_eth_rxtx_callback *rx_dump_cb[RTE_MAX_QUEUES_PER_PORT+1];
+	const struct rte_eth_rxtx_callback *tx_dump_cb[RTE_MAX_QUEUES_PER_PORT+1];
 #ifdef SOFTNIC
 	struct softnic_port     softport;  /**< softnic params */
 #endif
 	/**< metadata value to insert in Tx packets. */
 	uint32_t		tx_metadata;
-	const struct rte_eth_rxtx_callback *tx_set_md_cb[MAX_QUEUE_ID+1];
+	const struct rte_eth_rxtx_callback *tx_set_md_cb[RTE_MAX_QUEUES_PER_PORT+1];
 };
 
 /**
-- 
2.23.0