diff options
Diffstat (limited to 'app/test/test_pmd_ring_perf.c')
| -rw-r--r-- | app/test/test_pmd_ring_perf.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/app/test/test_pmd_ring_perf.c b/app/test/test_pmd_ring_perf.c new file mode 100644 index 00000000..3077dbad --- /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); |