app/test/test_timer_perf.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
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  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
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  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include "test.h"
  35
  36 #include <stdio.h>
  37 #include <unistd.h>
  38 #include <inttypes.h>
  39 #include <rte_cycles.h>
  40 #include <rte_timer.h>
  41 #include <rte_common.h>
  42 #include <rte_lcore.h>
  43 #include <rte_random.h>
  44 #include <rte_malloc.h>
  45
  46 #define MAX_ITERATIONS 1000000
  47
  48 int outstanding_count = 0;
  49
  50 static void
  51 timer_cb(struct rte_timer *t __rte_unused, void *param __rte_unused)
  52 {
  53         outstanding_count--;
  54 }
  55
  56 #define DELAY_SECONDS 1
  57
  58 #ifdef RTE_EXEC_ENV_LINUXAPP
  59 #define do_delay() usleep(10)
  60 #else
  61 #define do_delay() rte_pause()
  62 #endif
  63
  64 static int
  65 test_timer_perf(void)
  66 {
  67         unsigned iterations = 100;
  68         unsigned i;
  69         struct rte_timer *tms;
  70         uint64_t start_tsc, end_tsc, delay_start;
  71         unsigned lcore_id = rte_lcore_id();
  72
  73         tms = rte_malloc(NULL, sizeof(*tms) * MAX_ITERATIONS, 0);
  74
  75         for (i = 0; i < MAX_ITERATIONS; i++)
  76                 rte_timer_init(&tms[i]);
  77
  78         const uint64_t ticks = rte_get_timer_hz() * DELAY_SECONDS;
  79         const uint64_t ticks_per_ms = rte_get_tsc_hz()/1000;
  80         const uint64_t ticks_per_us = ticks_per_ms/1000;
  81
  82         while (iterations <= MAX_ITERATIONS) {
  83
  84                 printf("Appending %u timers\n", iterations);
  85                 start_tsc = rte_rdtsc();
  86                 for (i = 0; i < iterations; i++)
  87                         rte_timer_reset(&tms[i], ticks, SINGLE, lcore_id,
  88                                         timer_cb, NULL);
  89                 end_tsc = rte_rdtsc();
  90                 printf("Time for %u timers: %"PRIu64" (%"PRIu64"ms), ", iterations,
  91                                 end_tsc-start_tsc, (end_tsc-start_tsc+ticks_per_ms/2)/(ticks_per_ms));
  92                 printf("Time per timer: %"PRIu64" (%"PRIu64"us)\n",
  93                                 (end_tsc-start_tsc)/iterations,
  94                                 ((end_tsc-start_tsc)/iterations+ticks_per_us/2)/(ticks_per_us));
  95                 outstanding_count = iterations;
  96                 delay_start = rte_get_timer_cycles();
  97                 while (rte_get_timer_cycles() < delay_start + ticks)
  98                         do_delay();
  99
 100                 start_tsc = rte_rdtsc();
 101                 while (outstanding_count)
 102                         rte_timer_manage();
 103                 end_tsc = rte_rdtsc();
 104                 printf("Time for %u callbacks: %"PRIu64" (%"PRIu64"ms), ", iterations,
 105                                 end_tsc-start_tsc, (end_tsc-start_tsc+ticks_per_ms/2)/(ticks_per_ms));
 106                 printf("Time per callback: %"PRIu64" (%"PRIu64"us)\n",
 107                                 (end_tsc-start_tsc)/iterations,
 108                                 ((end_tsc-start_tsc)/iterations+ticks_per_us/2)/(ticks_per_us));
 109
 110                 printf("Resetting %u timers\n", iterations);
 111                 start_tsc = rte_rdtsc();
 112                 for (i = 0; i < iterations; i++)
 113                         rte_timer_reset(&tms[i], rte_rand() % ticks, SINGLE, lcore_id,
 114                                         timer_cb, NULL);
 115                 end_tsc = rte_rdtsc();
 116                 printf("Time for %u timers: %"PRIu64" (%"PRIu64"ms), ", iterations,
 117                                 end_tsc-start_tsc, (end_tsc-start_tsc+ticks_per_ms/2)/(ticks_per_ms));
 118                 printf("Time per timer: %"PRIu64" (%"PRIu64"us)\n",
 119                                 (end_tsc-start_tsc)/iterations,
 120                                 ((end_tsc-start_tsc)/iterations+ticks_per_us/2)/(ticks_per_us));
 121                 outstanding_count = iterations;
 122
 123                 delay_start = rte_get_timer_cycles();
 124                 while (rte_get_timer_cycles() < delay_start + ticks)
 125                         do_delay();
 126
 127                 rte_timer_manage();
 128                 if (outstanding_count != 0) {
 129                         printf("Error: outstanding callback count = %d\n", outstanding_count);
 130                         return -1;
 131                 }
 132
 133                 iterations *= 10;
 134                 printf("\n");
 135         }
 136
 137         printf("All timers processed ok\n");
 138
 139         /* measure time to poll an empty timer list */
 140         start_tsc = rte_rdtsc();
 141         for (i = 0; i < iterations; i++)
 142                 rte_timer_manage();
 143         end_tsc = rte_rdtsc();
 144         printf("\nTime per rte_timer_manage with zero timers: %"PRIu64" cycles\n",
 145                         (end_tsc - start_tsc + iterations/2) / iterations);
 146
 147         /* measure time to poll a timer list with timers, but without
 148          * calling any callbacks */
 149         rte_timer_reset(&tms[0], ticks * 100, SINGLE, lcore_id,
 150                         timer_cb, NULL);
 151         start_tsc = rte_rdtsc();
 152         for (i = 0; i < iterations; i++)
 153                 rte_timer_manage();
 154         end_tsc = rte_rdtsc();
 155         printf("Time per rte_timer_manage with zero callbacks: %"PRIu64" cycles\n",
 156                         (end_tsc - start_tsc + iterations/2) / iterations);
 157
 158         return 0;
 159 }
 160
 161 static struct test_command timer_perf_cmd = {
 162         .command = "timer_perf_autotest",
 163         .callback = test_timer_perf,
 164 };
 165 REGISTER_TEST_COMMAND(timer_perf_cmd);