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37 #include <sys/types.h>
38 #include <sys/sysctl.h>
41 #include <rte_common.h>
43 #include <rte_cycles.h>
44 #include <rte_tailq.h>
45 #include <rte_memory.h>
46 #include <rte_memzone.h>
48 #include <rte_debug.h>
50 #include "eal_private.h"
51 #include "eal_internal_cfg.h"
53 #ifdef RTE_LIBEAL_USE_HPET
54 #warning HPET is not supported in FreeBSD
57 enum timer_source eal_timer_source = EAL_TIMER_TSC;
59 /* The frequency of the RDTSC timer resolution */
60 static uint64_t eal_tsc_resolution_hz = 0;
63 rte_delay_us(unsigned us)
65 const uint64_t start = rte_get_timer_cycles();
66 const uint64_t ticks = (uint64_t)us * rte_get_timer_hz() / 1E6;
67 while ((rte_get_timer_cycles() - start) < ticks)
74 return eal_tsc_resolution_hz;
78 set_tsc_freq_from_sysctl(void)
86 if (sysctlbyname("kern.timecounter.smp_tsc", &tmp, &sz, NULL, 0))
87 RTE_LOG(WARNING, EAL, "%s\n", strerror(errno));
89 RTE_LOG(WARNING, EAL, "TSC is not safe to use in SMP mode\n");
93 if (sysctlbyname("kern.timecounter.invariant_tsc", &tmp, &sz, NULL, 0))
94 RTE_LOG(WARNING, EAL, "%s\n", strerror(errno));
96 RTE_LOG(WARNING, EAL, "TSC is not invariant\n");
98 sz = sizeof(eal_tsc_resolution_hz);
99 if (sysctlbyname("machdep.tsc_freq", &eal_tsc_resolution_hz, &sz, NULL, 0)) {
100 RTE_LOG(WARNING, EAL, "%s\n", strerror(errno));
108 set_tsc_freq_fallback(void)
110 RTE_LOG(WARNING, EAL, "WARNING: clock_gettime cannot use "
111 "CLOCK_MONOTONIC_RAW and HPET is not available"
112 " - clock timings may be less accurate.\n");
113 /* assume that the sleep(1) will sleep for 1 second */
114 uint64_t start = rte_rdtsc();
116 eal_tsc_resolution_hz = rte_rdtsc() - start;
120 * This function measures the TSC frequency. It uses a variety of approaches.
122 * 1. Read the TSC frequency value provided by the kernel
123 * 2. If above does not work, just sleep for 1 second and tune off that,
124 * printing a warning about inaccuracy of timing
129 if (set_tsc_freq_from_sysctl() < 0)
130 set_tsc_freq_fallback();
132 RTE_LOG(INFO, EAL, "TSC frequency is ~%"PRIu64" KHz\n",
133 eal_tsc_resolution_hz/1000);
137 rte_eal_timer_init(void)