[dpdk-dev] [PATCH v4 1/3] packet_ordering: add statistics for each worker thread

[Phil Yang <phil.yang@arm.com>]

The current implementation using the '__sync' built-ins to synchronize
statistics within worker threads. The '__sync' built-ins functions are
full barriers which will affect the performance, so add a per worker
packets statistics to remove the synchronisation between worker threads.

Since the maximum core number can get to 256, so disable the per core
stats print in default and add the --insight-worker option to enable it.

For example:
sudo examples/packet_ordering/arm64-armv8a-linuxapp-gcc/packet_ordering \
-l 112-115 --socket-mem=1024,1024 -n 4 -- -p 0x03 --insight-worker

RX thread stats:
 - Pkts rxd:                            226539223
 - Pkts enqd to workers ring:           226539223

Worker thread stats on core [113]:
 - Pkts deqd from workers ring:         77557888
 - Pkts enqd to tx ring:                77557888
 - Pkts enq to tx failed:               0

Worker thread stats on core [114]:
 - Pkts deqd from workers ring:         148981335
 - Pkts enqd to tx ring:                148981335
 - Pkts enq to tx failed:               0

Worker thread stats:
 - Pkts deqd from workers ring:         226539223
 - Pkts enqd to tx ring:                226539223
 - Pkts enq to tx failed:               0

TX stats:
 - Pkts deqd from tx ring:              226539223
 - Ro Pkts transmitted:                 226539168
 - Ro Pkts tx failed:                   0
 - Pkts transmitted w/o reorder:        0
 - Pkts tx failed w/o reorder:          0

Suggested-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Signed-off-by: Phil Yang <phil.yang@arm.com>
Reviewed-by: Gavin Hu <gavin.hu@arm.com>
---
 doc/guides/sample_app_ug/packet_ordering.rst |  4 ++-
 examples/packet_ordering/main.c              | 50 +++++++++++++++++++++++++---
 2 files changed, 48 insertions(+), 6 deletions(-)

diff --git a/doc/guides/sample_app_ug/packet_ordering.rst b/doc/guides/sample_app_ug/packet_ordering.rst
index 7cfcf3f..1c8ee5d 100644
--- a/doc/guides/sample_app_ug/packet_ordering.rst
+++ b/doc/guides/sample_app_ug/packet_ordering.rst
@@ -43,7 +43,7 @@ The application execution command line is:
 
 .. code-block:: console
 
-    ./test-pipeline [EAL options] -- -p PORTMASK [--disable-reorder]
+    ./packet_ordering [EAL options] -- -p PORTMASK [--disable-reorder] [--insight-worker]
 
 The -c EAL CPU_COREMASK option has to contain at least 3 CPU cores.
 The first CPU core in the core mask is the master core and would be assigned to
@@ -56,3 +56,5 @@ then the other pair from 2 to 3 and from 3 to 2, having [0,1] and [2,3] pairs.
 
 The disable-reorder long option does, as its name implies, disable the reordering
 of traffic, which should help evaluate reordering performance impact.
+
+The insight-worker long option enables output the packet statistics of each worker thread.
diff --git a/examples/packet_ordering/main.c b/examples/packet_ordering/main.c
index 149bfdd..1f1bf37 100644
--- a/examples/packet_ordering/main.c
+++ b/examples/packet_ordering/main.c
@@ -31,6 +31,7 @@
 
 unsigned int portmask;
 unsigned int disable_reorder;
+unsigned int insight_worker;
 volatile uint8_t quit_signal;
 
 static struct rte_mempool *mbuf_pool;
@@ -71,6 +72,14 @@ volatile struct app_stats {
 	} tx __rte_cache_aligned;
 } app_stats;
 
+/* per worker lcore stats */
+struct wkr_stats_per {
+		uint64_t deq_pkts;
+		uint64_t enq_pkts;
+		uint64_t enq_failed_pkts;
+} __rte_cache_aligned;
+
+static struct wkr_stats_per wkr_stats[RTE_MAX_LCORE] = { {0} };
 /**
  * Get the last enabled lcore ID
  *
@@ -152,6 +161,7 @@ parse_args(int argc, char **argv)
 	char *prgname = argv[0];
 	static struct option lgopts[] = {
 		{"disable-reorder", 0, 0, 0},
+		{"insight-worker", 0, 0, 0},
 		{NULL, 0, 0, 0}
 	};
 
@@ -175,6 +185,11 @@ parse_args(int argc, char **argv)
 				printf("reorder disabled\n");
 				disable_reorder = 1;
 			}
+			if (!strcmp(lgopts[option_index].name,
+						"insight-worker")) {
+				printf("print all worker statistics\n");
+				insight_worker = 1;
+			}
 			break;
 		default:
 			print_usage(prgname);
@@ -319,6 +334,11 @@ print_stats(void)
 {
 	uint16_t i;
 	struct rte_eth_stats eth_stats;
+	unsigned int lcore_id, last_lcore_id, master_lcore_id, end_w_lcore_id;
+
+	last_lcore_id   = get_last_lcore_id();
+	master_lcore_id = rte_get_master_lcore();
+	end_w_lcore_id  = get_previous_lcore_id(last_lcore_id);
 
 	printf("\nRX thread stats:\n");
 	printf(" - Pkts rxd:				%"PRIu64"\n",
@@ -326,6 +346,26 @@ print_stats(void)
 	printf(" - Pkts enqd to workers ring:		%"PRIu64"\n",
 						app_stats.rx.enqueue_pkts);
 
+	for (lcore_id = 0; lcore_id <= end_w_lcore_id; lcore_id++) {
+		if (insight_worker
+			&& rte_lcore_is_enabled(lcore_id)
+			&& lcore_id != master_lcore_id) {
+			printf("\nWorker thread stats on core [%u]:\n",
+					lcore_id);
+			printf(" - Pkts deqd from workers ring:		%"PRIu64"\n",
+					wkr_stats[lcore_id].deq_pkts);
+			printf(" - Pkts enqd to tx ring:		%"PRIu64"\n",
+					wkr_stats[lcore_id].enq_pkts);
+			printf(" - Pkts enq to tx failed:		%"PRIu64"\n",
+					wkr_stats[lcore_id].enq_failed_pkts);
+		}
+
+		app_stats.wkr.dequeue_pkts += wkr_stats[lcore_id].deq_pkts;
+		app_stats.wkr.enqueue_pkts += wkr_stats[lcore_id].enq_pkts;
+		app_stats.wkr.enqueue_failed_pkts +=
+			wkr_stats[lcore_id].enq_failed_pkts;
+	}
+
 	printf("\nWorker thread stats:\n");
 	printf(" - Pkts deqd from workers ring:		%"PRIu64"\n",
 						app_stats.wkr.dequeue_pkts);
@@ -432,13 +472,14 @@ worker_thread(void *args_ptr)
 	struct rte_mbuf *burst_buffer[MAX_PKTS_BURST] = { NULL };
 	struct rte_ring *ring_in, *ring_out;
 	const unsigned xor_val = (nb_ports > 1);
+	unsigned int core_id = rte_lcore_id();
 
 	args = (struct worker_thread_args *) args_ptr;
 	ring_in  = args->ring_in;
 	ring_out = args->ring_out;
 
 	RTE_LOG(INFO, REORDERAPP, "%s() started on lcore %u\n", __func__,
-							rte_lcore_id());
+							core_id);
 
 	while (!quit_signal) {
 
@@ -448,7 +489,7 @@ worker_thread(void *args_ptr)
 		if (unlikely(burst_size == 0))
 			continue;
 
-		__sync_fetch_and_add(&app_stats.wkr.dequeue_pkts, burst_size);
+		wkr_stats[core_id].deq_pkts += burst_size;
 
 		/* just do some operation on mbuf */
 		for (i = 0; i < burst_size;)
@@ -457,11 +498,10 @@ worker_thread(void *args_ptr)
 		/* enqueue the modified mbufs to workers_to_tx ring */
 		ret = rte_ring_enqueue_burst(ring_out, (void *)burst_buffer,
 				burst_size, NULL);
-		__sync_fetch_and_add(&app_stats.wkr.enqueue_pkts, ret);
+		wkr_stats[core_id].enq_pkts += ret;
 		if (unlikely(ret < burst_size)) {
 			/* Return the mbufs to their respective pool, dropping packets */
-			__sync_fetch_and_add(&app_stats.wkr.enqueue_failed_pkts,
-					(int)burst_size - ret);
+			wkr_stats[core_id].enq_failed_pkts += burst_size - ret;
 			pktmbuf_free_bulk(&burst_buffer[ret], burst_size - ret);
 		}
 	}
-- 
2.7.4