app/test/test_timer_perf.c

   1 /*-
   2  *   BSD LICENSE
   3  *
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  19  *       from this software without specific prior written permission.
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  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 <stdio.h>
  35 #include <unistd.h>
  36 #include <inttypes.h>
  37 #include <rte_cycles.h>
  38 #include <rte_timer.h>
  39 #include <rte_common.h>
  40 #include <rte_lcore.h>
  41 #include <rte_random.h>
  42 #include <rte_malloc.h>
  43 #include "test.h"
  44
  45 #define MAX_ITERATIONS 1000000
  46
  47 int outstanding_count = 0;
  48
  49 static void
  50 timer_cb(struct rte_timer *t __rte_unused, void *param __rte_unused)
  51 {
  52         outstanding_count--;
  53 }
  54
  55 #define DELAY_SECONDS 1
  56
  57 #ifdef RTE_EXEC_ENV_LINUXAPP
  58 #define do_delay() usleep(10)
  59 #else
  60 #define do_delay() rte_pause()
  61 #endif
  62
  63 int
  64 test_timer_perf(void)
  65 {
  66         unsigned iterations = 100;
  67         unsigned i;
  68         struct rte_timer *tms;
  69         uint64_t start_tsc, end_tsc, delay_start;
  70         unsigned lcore_id = rte_lcore_id();
  71
  72         tms = rte_malloc(NULL, sizeof(*tms) * MAX_ITERATIONS, 0);
  73
  74         for (i = 0; i < MAX_ITERATIONS; i++)
  75                 rte_timer_init(&tms[i]);
  76
  77         const uint64_t ticks = rte_get_timer_hz() * DELAY_SECONDS;
  78         const uint64_t ticks_per_ms = rte_get_tsc_hz()/1000;
  79         const uint64_t ticks_per_us = ticks_per_ms/1000;
  80
  81         while (iterations <= MAX_ITERATIONS) {
  82
  83                 printf("Appending %u timers\n", iterations);
  84                 start_tsc = rte_rdtsc();
  85                 for (i = 0; i < iterations; i++)
  86                         rte_timer_reset(&tms[i], ticks, SINGLE, lcore_id,
  87                                         timer_cb, NULL);
  88                 end_tsc = rte_rdtsc();
  89                 printf("Time for %u timers: %"PRIu64" (%"PRIu64"ms), ", iterations,
  90                                 end_tsc-start_tsc, (end_tsc-start_tsc+ticks_per_ms/2)/(ticks_per_ms));
  91                 printf("Time per timer: %"PRIu64" (%"PRIu64"us)\n",
  92                                 (end_tsc-start_tsc)/iterations,
  93                                 ((end_tsc-start_tsc)/iterations+ticks_per_us/2)/(ticks_per_us));
  94                 outstanding_count = iterations;
  95                 delay_start = rte_get_timer_cycles();
  96                 while (rte_get_timer_cycles() < delay_start + ticks)
  97                         do_delay();
  98
  99                 start_tsc = rte_rdtsc();
 100                 while (outstanding_count)
 101                         rte_timer_manage();
 102                 end_tsc = rte_rdtsc();
 103                 printf("Time for %u callbacks: %"PRIu64" (%"PRIu64"ms), ", iterations,
 104                                 end_tsc-start_tsc, (end_tsc-start_tsc+ticks_per_ms/2)/(ticks_per_ms));
 105                 printf("Time per callback: %"PRIu64" (%"PRIu64"us)\n",
 106                                 (end_tsc-start_tsc)/iterations,
 107                                 ((end_tsc-start_tsc)/iterations+ticks_per_us/2)/(ticks_per_us));
 108
 109                 printf("Resetting %u timers\n", iterations);
 110                 start_tsc = rte_rdtsc();
 111                 for (i = 0; i < iterations; i++)
 112                         rte_timer_reset(&tms[i], rte_rand() % ticks, SINGLE, lcore_id,
 113                                         timer_cb, NULL);
 114                 end_tsc = rte_rdtsc();
 115                 printf("Time for %u timers: %"PRIu64" (%"PRIu64"ms), ", iterations,
 116                                 end_tsc-start_tsc, (end_tsc-start_tsc+ticks_per_ms/2)/(ticks_per_ms));
 117                 printf("Time per timer: %"PRIu64" (%"PRIu64"us)\n",
 118                                 (end_tsc-start_tsc)/iterations,
 119                                 ((end_tsc-start_tsc)/iterations+ticks_per_us/2)/(ticks_per_us));
 120                 outstanding_count = iterations;
 121
 122                 delay_start = rte_get_timer_cycles();
 123                 while (rte_get_timer_cycles() < delay_start + ticks)
 124                         do_delay();
 125
 126                 rte_timer_manage();
 127                 if (outstanding_count != 0) {
 128                         printf("Error: outstanding callback count = %d\n", outstanding_count);
 129                         return -1;
 130                 }
 131
 132                 iterations *= 10;
 133                 printf("\n");
 134         }
 135
 136         printf("All timers processed ok\n");
 137
 138         /* measure time to poll an empty timer list */
 139         start_tsc = rte_rdtsc();
 140         for (i = 0; i < iterations; i++)
 141                 rte_timer_manage();
 142         end_tsc = rte_rdtsc();
 143         printf("\nTime per rte_timer_manage with zero timers: %"PRIu64" cycles\n",
 144                         (end_tsc - start_tsc + iterations/2) / iterations);
 145
 146         /* measure time to poll a timer list with timers, but without
 147          * calling any callbacks */
 148         rte_timer_reset(&tms[0], ticks * 100, SINGLE, lcore_id,
 149                         timer_cb, NULL);
 150         start_tsc = rte_rdtsc();
 151         for (i = 0; i < iterations; i++)
 152                 rte_timer_manage();
 153         end_tsc = rte_rdtsc();
 154         printf("Time per rte_timer_manage with zero callbacks: %"PRIu64" cycles\n",
 155                         (end_tsc - start_tsc + iterations/2) / iterations);
 156
 157         return 0;
 158 }