app/test: add performance test for ring driver
authorBruce Richardson <bruce.richardson@intel.com>
Wed, 30 Sep 2015 12:12:22 +0000 (13:12 +0100)
committerThomas Monjalon <thomas.monjalon@6wind.com>
Tue, 3 Nov 2015 01:01:58 +0000 (02:01 +0100)
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@intel.com>
Acked-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
MAINTAINERS
app/test/Makefile
app/test/test_pmd_ring_perf.c [new file with mode: 0644]

index 7b1e079..c8be5d2 100644 (file)
@@ -289,6 +289,7 @@ M: Bruce Richardson <bruce.richardson@intel.com>
 F: drivers/net/ring/
 F: doc/guides/nics/pcap_ring.rst
 F: app/test/test_pmd_ring.c
+F: app/test/test_pmd_ring_perf.c
 
 Null PMD
 M: Tetsuya Mukawa <mukawa@igel.co.jp>
index ef9125d..de63235 100644 (file)
@@ -148,6 +148,7 @@ endif
 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 (file)
index 0000000..3077dba
--- /dev/null
@@ -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);