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33 * version: DPDK.L.1.2.3-3
39 #include <cmdline_parse.h>
41 #include <rte_common.h>
42 #include <rte_cycles.h>
52 * - Loop N times and check that the timer alway increments and
53 * never decrements during this loop.
55 * - Wait one second using rte_usleep() and check that the increment
56 * of cycles is correct with regard to the frequency of the timer.
63 uint64_t start_cycles, cycles, prev_cycles;
64 uint64_t hz = rte_get_hpet_hz();
65 uint64_t max_inc = (hz / 100); /* 10 ms max between 2 reads */
67 /* check that the timer is always incrementing */
68 start_cycles = rte_get_hpet_cycles();
69 prev_cycles = start_cycles;
71 cycles = rte_get_hpet_cycles();
72 if ((uint64_t)(cycles - prev_cycles) > max_inc) {
73 printf("increment too high or going backwards\n");
79 /* check that waiting 1 second is precise */
80 prev_cycles = rte_get_hpet_cycles();
81 rte_delay_us(1000000);
82 cycles = rte_get_hpet_cycles();
83 if ((uint64_t)(cycles - prev_cycles) > (hz + max_inc)) {
84 printf("delay_us is not accurate\n");
87 cycles = rte_get_hpet_cycles();
88 if ((uint64_t)(cycles - prev_cycles) < (hz)) {
89 printf("delay_us is not accurate\n");