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37 #include <cmdline_parse.h>
39 #include <rte_common.h>
40 #include <rte_cycles.h>
50 * - Loop N times and check that the timer always increments and
51 * never decrements during this loop.
53 * - Wait one second using rte_usleep() and check that the increment
54 * of cycles is correct with regard to the frequency of the timer.
61 uint64_t start_cycles, cycles, prev_cycles;
62 uint64_t hz = rte_get_timer_hz();
63 uint64_t max_inc = (hz / 100); /* 10 ms max between 2 reads */
65 /* check that the timer is always incrementing */
66 start_cycles = rte_get_timer_cycles();
67 prev_cycles = start_cycles;
69 cycles = rte_get_timer_cycles();
70 if ((uint64_t)(cycles - prev_cycles) > max_inc) {
71 printf("increment too high or going backwards\n");
77 /* check that waiting 1 second is precise */
78 prev_cycles = rte_get_timer_cycles();
79 rte_delay_us(1000000);
80 cycles = rte_get_timer_cycles();
82 if ((uint64_t)(cycles - prev_cycles) > (hz + max_inc)) {
83 printf("delay_us is not accurate: too long\n");
86 if ((uint64_t)(cycles - prev_cycles) < (hz - max_inc)) {
87 printf("delay_us is not accurate: too short\n");