test/test/test_timer_perf.c

   1 /*-
   2  *   BSD LICENSE
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  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 #include <rte_pause.h>
  46
  47 #define MAX_ITERATIONS 1000000
  48
  49 int outstanding_count = 0;
  50
  51 static void
  52 timer_cb(struct rte_timer *t __rte_unused, void *param __rte_unused)
  53 {
  54         outstanding_count--;
  55 }
  56
  57 #define DELAY_SECONDS 1
  58
  59 #ifdef RTE_EXEC_ENV_LINUXAPP
  60 #define do_delay() usleep(10)
  61 #else
  62 #define do_delay() rte_pause()
  63 #endif
  64
  65 static int
  66 test_timer_perf(void)
  67 {
  68         unsigned iterations = 100;
  69         unsigned i;
  70         struct rte_timer *tms;
  71         uint64_t start_tsc, end_tsc, delay_start;
  72         unsigned lcore_id = rte_lcore_id();
  73
  74         tms = rte_malloc(NULL, sizeof(*tms) * MAX_ITERATIONS, 0);
  75
  76         for (i = 0; i < MAX_ITERATIONS; i++)
  77                 rte_timer_init(&tms[i]);
  78
  79         const uint64_t ticks = rte_get_timer_hz() * DELAY_SECONDS;
  80         const uint64_t ticks_per_ms = rte_get_tsc_hz()/1000;
  81         const uint64_t ticks_per_us = ticks_per_ms/1000;
  82
  83         while (iterations <= MAX_ITERATIONS) {
  84
  85                 printf("Appending %u timers\n", iterations);
  86                 start_tsc = rte_rdtsc();
  87                 for (i = 0; i < iterations; i++)
  88                         rte_timer_reset(&tms[i], ticks, SINGLE, lcore_id,
  89                                         timer_cb, NULL);
  90                 end_tsc = rte_rdtsc();
  91                 printf("Time for %u timers: %"PRIu64" (%"PRIu64"ms), ", iterations,
  92                                 end_tsc-start_tsc, (end_tsc-start_tsc+ticks_per_ms/2)/(ticks_per_ms));
  93                 printf("Time per timer: %"PRIu64" (%"PRIu64"us)\n",
  94                                 (end_tsc-start_tsc)/iterations,
  95                                 ((end_tsc-start_tsc)/iterations+ticks_per_us/2)/(ticks_per_us));
  96                 outstanding_count = iterations;
  97                 delay_start = rte_get_timer_cycles();
  98                 while (rte_get_timer_cycles() < delay_start + ticks)
  99                         do_delay();
 100
 101                 start_tsc = rte_rdtsc();
 102                 while (outstanding_count)
 103                         rte_timer_manage();
 104                 end_tsc = rte_rdtsc();
 105                 printf("Time for %u callbacks: %"PRIu64" (%"PRIu64"ms), ", iterations,
 106                                 end_tsc-start_tsc, (end_tsc-start_tsc+ticks_per_ms/2)/(ticks_per_ms));
 107                 printf("Time per callback: %"PRIu64" (%"PRIu64"us)\n",
 108                                 (end_tsc-start_tsc)/iterations,
 109                                 ((end_tsc-start_tsc)/iterations+ticks_per_us/2)/(ticks_per_us));
 110
 111                 printf("Resetting %u timers\n", iterations);
 112                 start_tsc = rte_rdtsc();
 113                 for (i = 0; i < iterations; i++)
 114                         rte_timer_reset(&tms[i], rte_rand() % ticks, SINGLE, lcore_id,
 115                                         timer_cb, NULL);
 116                 end_tsc = rte_rdtsc();
 117                 printf("Time for %u timers: %"PRIu64" (%"PRIu64"ms), ", iterations,
 118                                 end_tsc-start_tsc, (end_tsc-start_tsc+ticks_per_ms/2)/(ticks_per_ms));
 119                 printf("Time per timer: %"PRIu64" (%"PRIu64"us)\n",
 120                                 (end_tsc-start_tsc)/iterations,
 121                                 ((end_tsc-start_tsc)/iterations+ticks_per_us/2)/(ticks_per_us));
 122                 outstanding_count = iterations;
 123
 124                 delay_start = rte_get_timer_cycles();
 125                 while (rte_get_timer_cycles() < delay_start + ticks)
 126                         do_delay();
 127
 128                 rte_timer_manage();
 129                 if (outstanding_count != 0) {
 130                         printf("Error: outstanding callback count = %d\n", outstanding_count);
 131                         return -1;
 132                 }
 133
 134                 iterations *= 10;
 135                 printf("\n");
 136         }
 137
 138         printf("All timers processed ok\n");
 139
 140         /* measure time to poll an empty timer list */
 141         start_tsc = rte_rdtsc();
 142         for (i = 0; i < iterations; i++)
 143                 rte_timer_manage();
 144         end_tsc = rte_rdtsc();
 145         printf("\nTime per rte_timer_manage with zero timers: %"PRIu64" cycles\n",
 146                         (end_tsc - start_tsc + iterations/2) / iterations);
 147
 148         /* measure time to poll a timer list with timers, but without
 149          * calling any callbacks */
 150         rte_timer_reset(&tms[0], ticks * 100, SINGLE, lcore_id,
 151                         timer_cb, NULL);
 152         start_tsc = rte_rdtsc();
 153         for (i = 0; i < iterations; i++)
 154                 rte_timer_manage();
 155         end_tsc = rte_rdtsc();
 156         printf("Time per rte_timer_manage with zero callbacks: %"PRIu64" cycles\n",
 157                         (end_tsc - start_tsc + iterations/2) / iterations);
 158
 159         rte_free(tms);
 160         return 0;
 161 }
 162
 163 REGISTER_TEST_COMMAND(timer_perf_autotest, test_timer_perf);