[dpdk-dev] [PATCH 4/4] test: Add perf test for ring pmd

[Bruce Richardson]

Add a performance test for ring pmd, comparing performance of the pmd
compared to the basic rte_ring APIs.

Signed-off-by: Bruce Richardson <bruce.richardson at intel.com>
---
 app/test/Makefile             |   1 +
 app/test/test_pmd_ring_perf.c | 188 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 189 insertions(+)
 create mode 100644 app/test/test_pmd_ring_perf.c

diff --git a/app/test/Makefile b/app/test/Makefile
index 294618f..14fa502 100644
--- a/app/test/Makefile
+++ b/app/test/Makefile
@@ -141,6 +141,7 @@ SRCS-$(CONFIG_RTE_LIBRTE_PMD_BOND) += test_link_bonding_mode4.c
 endif
 
 SRCS-$(CONFIG_RTE_LIBRTE_PMD_RING) += test_pmd_ring.c
+SRCS-$(CONFIG_RTE_LIBRTE_PMD_RING) += test_pmd_ring_perf.c
 SRCS-$(CONFIG_RTE_LIBRTE_KVARGS) += test_kvargs.c
 
 CFLAGS += -O3
diff --git a/app/test/test_pmd_ring_perf.c b/app/test/test_pmd_ring_perf.c
new file mode 100644
index 0000000..3077dba
--- /dev/null
+++ b/app/test/test_pmd_ring_perf.c
@@ -0,0 +1,188 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2015 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+#include <stdio.h>
+#include <inttypes.h>
+#include <rte_ring.h>
+#include <rte_cycles.h>
+#include <rte_launch.h>
+#include <rte_ethdev.h>
+#include <rte_eth_ring.h>
+
+#include "test.h"
+
+#define RING_NAME "RING_PERF"
+#define RING_SIZE 4096
+#define MAX_BURST 32
+
+/*
+ * the sizes to enqueue and dequeue in testing
+ * (marked volatile so they won't be seen as compile-time constants)
+ */
+static const volatile unsigned bulk_sizes[] = { 1, 8, 32 };
+
+/* The ring structure used for tests */
+static struct rte_ring *r;
+static uint8_t ring_ethdev_port;
+
+/* Get cycle counts for dequeuing from an empty ring. Should be 2 or 3 cycles */
+static void
+test_empty_dequeue(void)
+{
+	const unsigned iter_shift = 26;
+	const unsigned iterations = 1 << iter_shift;
+	unsigned i = 0;
+	void *burst[MAX_BURST];
+
+	const uint64_t sc_start = rte_rdtsc();
+	for (i = 0; i < iterations; i++)
+		rte_ring_sc_dequeue_bulk(r, burst, bulk_sizes[0]);
+	const uint64_t sc_end = rte_rdtsc();
+
+	const uint64_t eth_start = rte_rdtsc();
+	for (i = 0; i < iterations; i++)
+		rte_eth_rx_burst(ring_ethdev_port, 0, (void *)burst,
+				bulk_sizes[0]);
+	const uint64_t eth_end = rte_rdtsc();
+
+	printf("Ring empty dequeue  : %.1F\n",
+			(double)(sc_end - sc_start) / iterations);
+	printf("Ethdev empty dequeue: %.1F\n",
+			(double)(eth_end - eth_start) / iterations);
+}
+
+/*
+ * Test function that determines how long an enqueue + dequeue of a single item
+ * takes on a single lcore. Result is for comparison with the bulk enq+deq.
+ */
+static void
+test_single_enqueue_dequeue(void)
+{
+	const unsigned iter_shift = 24;
+	const unsigned iterations = 1 << iter_shift;
+	unsigned i = 0;
+	void *burst = NULL;
+	struct rte_mbuf *mburst[1] = { NULL };
+
+	const uint64_t sc_start = rte_rdtsc_precise();
+	rte_compiler_barrier();
+	for (i = 0; i < iterations; i++) {
+		rte_ring_enqueue_bulk(r, &burst, 1);
+		rte_ring_dequeue_bulk(r, &burst, 1);
+	}
+	const uint64_t sc_end = rte_rdtsc_precise();
+	rte_compiler_barrier();
+
+	const uint64_t eth_start = rte_rdtsc_precise();
+	rte_compiler_barrier();
+	for (i = 0; i < iterations; i++) {
+		rte_eth_tx_burst(ring_ethdev_port, 0, mburst, 1);
+		rte_eth_rx_burst(ring_ethdev_port, 0, mburst, 1);
+	}
+	const uint64_t eth_end = rte_rdtsc_precise();
+	rte_compiler_barrier();
+
+	printf("Ring single enq/dequeue  : %"PRIu64"\n",
+			(sc_end-sc_start) >> iter_shift);
+	printf("Ethdev single enq/dequeue: %"PRIu64"\n",
+			(eth_end-eth_start) >> iter_shift);
+}
+
+/* Times enqueue and dequeue on a single lcore */
+static void
+test_bulk_enqueue_dequeue(void)
+{
+	const unsigned iter_shift = 23;
+	const unsigned iterations = 1 << iter_shift;
+	unsigned sz, i = 0;
+	struct rte_mbuf *burst[MAX_BURST] = {0};
+
+	for (sz = 0; sz < sizeof(bulk_sizes)/sizeof(bulk_sizes[0]); sz++) {
+		const uint64_t sc_start = rte_rdtsc();
+		for (i = 0; i < iterations; i++) {
+			rte_ring_sp_enqueue_bulk(r, (void *)burst, bulk_sizes[sz]);
+			rte_ring_sc_dequeue_bulk(r, (void *)burst, bulk_sizes[sz]);
+		}
+		const uint64_t sc_end = rte_rdtsc();
+
+		const uint64_t eth_start = rte_rdtsc_precise();
+		rte_compiler_barrier();
+		for (i = 0; i < iterations; i++) {
+			rte_eth_tx_burst(ring_ethdev_port, 0, burst, bulk_sizes[sz]);
+			rte_eth_rx_burst(ring_ethdev_port, 0, burst, bulk_sizes[sz]);
+		}
+		const uint64_t eth_end = rte_rdtsc_precise();
+		rte_compiler_barrier();
+
+		double sc_avg = ((double)(sc_end-sc_start) /
+				(iterations * bulk_sizes[sz]));
+		double eth_avg = ((double)(eth_end-eth_start) /
+				(iterations * bulk_sizes[sz]));
+
+		printf("ring bulk enq/deq (size: %u) : %.1F\n", bulk_sizes[sz],
+				sc_avg);
+		printf("ethdev bulk enq/deq (size:%u): %.1F\n", bulk_sizes[sz],
+				eth_avg);
+
+		printf("\n");
+	}
+}
+
+static int
+test_ring_pmd_perf(void)
+{
+	r = rte_ring_create(RING_NAME, RING_SIZE, rte_socket_id(),
+			RING_F_SP_ENQ|RING_F_SC_DEQ);
+	if (r == NULL && (r = rte_ring_lookup(RING_NAME)) == NULL)
+		return -1;
+
+	ring_ethdev_port = rte_eth_from_ring(r);
+
+	printf("\n### Testing const single element enq/deq ###\n");
+	test_single_enqueue_dequeue();
+
+	printf("\n### Testing empty dequeue ###\n");
+	test_empty_dequeue();
+
+	printf("\n### Testing using a single lcore ###\n");
+	test_bulk_enqueue_dequeue();
+
+	return 0;
+}
+
+static struct test_command ring_pmd_perf_cmd = {
+	.command = "ring_pmd_perf_autotest",
+	.callback = test_ring_pmd_perf,
+};
+REGISTER_TEST_COMMAND(ring_pmd_perf_cmd);
-- 
2.4.3