app/test/test_timer_perf.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4
   5 #include "test.h"
   6
   7 #include <stdio.h>
   8 #include <unistd.h>
   9 #include <inttypes.h>
  10 #include <rte_cycles.h>
  11 #include <rte_timer.h>
  12 #include <rte_common.h>
  13 #include <rte_lcore.h>
  14 #include <rte_random.h>
  15 #include <rte_malloc.h>
  16 #include <rte_pause.h>
  17
  18 #define MAX_ITERATIONS 1000000
  19
  20 int outstanding_count = 0;
  21
  22 static void
  23 timer_cb(struct rte_timer *t __rte_unused, void *param __rte_unused)
  24 {
  25         outstanding_count--;
  26 }
  27
  28 #define DELAY_SECONDS 1
  29
  30 #ifdef RTE_EXEC_ENV_LINUX
  31 #define do_delay() usleep(10)
  32 #else
  33 #define do_delay() rte_pause()
  34 #endif
  35
  36 static int
  37 test_timer_perf(void)
  38 {
  39         unsigned iterations = 100;
  40         unsigned i;
  41         struct rte_timer *tms;
  42         uint64_t start_tsc, end_tsc, delay_start;
  43         unsigned lcore_id = rte_lcore_id();
  44
  45         tms = rte_malloc(NULL, sizeof(*tms) * MAX_ITERATIONS, 0);
  46
  47         for (i = 0; i < MAX_ITERATIONS; i++)
  48                 rte_timer_init(&tms[i]);
  49
  50         const uint64_t ticks = rte_get_timer_hz() * DELAY_SECONDS;
  51         const uint64_t ticks_per_ms = rte_get_tsc_hz()/1000;
  52         const uint64_t ticks_per_us = ticks_per_ms/1000;
  53
  54         while (iterations <= MAX_ITERATIONS) {
  55
  56                 printf("Appending %u timers\n", iterations);
  57                 start_tsc = rte_rdtsc();
  58                 for (i = 0; i < iterations; i++)
  59                         rte_timer_reset(&tms[i], ticks, SINGLE, lcore_id,
  60                                         timer_cb, NULL);
  61                 end_tsc = rte_rdtsc();
  62                 printf("Time for %u timers: %"PRIu64" (%"PRIu64"ms), ", iterations,
  63                                 end_tsc-start_tsc, (end_tsc-start_tsc+ticks_per_ms/2)/(ticks_per_ms));
  64                 printf("Time per timer: %"PRIu64" (%"PRIu64"us)\n",
  65                                 (end_tsc-start_tsc)/iterations,
  66                                 ((end_tsc-start_tsc)/iterations+ticks_per_us/2)/(ticks_per_us));
  67                 outstanding_count = iterations;
  68                 delay_start = rte_get_timer_cycles();
  69                 while (rte_get_timer_cycles() < delay_start + ticks)
  70                         do_delay();
  71
  72                 start_tsc = rte_rdtsc();
  73                 while (outstanding_count)
  74                         rte_timer_manage();
  75                 end_tsc = rte_rdtsc();
  76                 printf("Time for %u callbacks: %"PRIu64" (%"PRIu64"ms), ", iterations,
  77                                 end_tsc-start_tsc, (end_tsc-start_tsc+ticks_per_ms/2)/(ticks_per_ms));
  78                 printf("Time per callback: %"PRIu64" (%"PRIu64"us)\n",
  79                                 (end_tsc-start_tsc)/iterations,
  80                                 ((end_tsc-start_tsc)/iterations+ticks_per_us/2)/(ticks_per_us));
  81
  82                 printf("Resetting %u timers\n", iterations);
  83                 start_tsc = rte_rdtsc();
  84                 for (i = 0; i < iterations; i++)
  85                         rte_timer_reset(&tms[i], rte_rand() % ticks, SINGLE, lcore_id,
  86                                         timer_cb, NULL);
  87                 end_tsc = rte_rdtsc();
  88                 printf("Time for %u timers: %"PRIu64" (%"PRIu64"ms), ", iterations,
  89                                 end_tsc-start_tsc, (end_tsc-start_tsc+ticks_per_ms/2)/(ticks_per_ms));
  90                 printf("Time per timer: %"PRIu64" (%"PRIu64"us)\n",
  91                                 (end_tsc-start_tsc)/iterations,
  92                                 ((end_tsc-start_tsc)/iterations+ticks_per_us/2)/(ticks_per_us));
  93                 outstanding_count = iterations;
  94
  95                 delay_start = rte_get_timer_cycles();
  96                 while (rte_get_timer_cycles() < delay_start + ticks)
  97                         do_delay();
  98
  99                 rte_timer_manage();
 100                 if (outstanding_count != 0) {
 101                         printf("Error: outstanding callback count = %d\n", outstanding_count);
 102                         return -1;
 103                 }
 104
 105                 iterations *= 10;
 106                 printf("\n");
 107         }
 108
 109         printf("All timers processed ok\n");
 110
 111         /* measure time to poll an empty timer list */
 112         start_tsc = rte_rdtsc();
 113         for (i = 0; i < iterations; i++)
 114                 rte_timer_manage();
 115         end_tsc = rte_rdtsc();
 116         printf("\nTime per rte_timer_manage with zero timers: %"PRIu64" cycles\n",
 117                         (end_tsc - start_tsc + iterations/2) / iterations);
 118
 119         /* measure time to poll a timer list with timers, but without
 120          * calling any callbacks */
 121         rte_timer_reset(&tms[0], ticks * 100, SINGLE, lcore_id,
 122                         timer_cb, NULL);
 123         start_tsc = rte_rdtsc();
 124         for (i = 0; i < iterations; i++)
 125                 rte_timer_manage();
 126         end_tsc = rte_rdtsc();
 127         printf("Time per rte_timer_manage with zero callbacks: %"PRIu64" cycles\n",
 128                         (end_tsc - start_tsc + iterations/2) / iterations);
 129
 130         rte_free(tms);
 131         return 0;
 132 }
 133
 134 REGISTER_TEST_COMMAND(timer_perf_autotest, test_timer_perf);