WebJul 23, 2024 · 可是clocksource并没有保存时钟的频率F，因为使用上面的公式进行计算，需要使用浮点运算，这在内核中是不允许的，因此，内核使用了另外一个变通的办法，根 … Web* clocksource surrounding a read of the clocksource being validated. * This delay could be due to SMIs, NMIs, or to VCPU preemptions. Used as * a lower bound for cs->uncertainty_margin values when registering clocks. * * The default of 500 parts per million is based on NTP's limits. * If a clocksource is good enough for NTP, it is good enough ...

clock source in Linux - Stack Overflow

WebFeb 18, 2014 · Measuring Latency in Linux. For measuring latency in modern systems, we need to be able to measure intervals in microseconds at least, and preferably in nanoseconds or better. The good news is that with relatively modern hardware and software, it is possible to accurately measure time intervals as small as (some smallish number of) … WebApr 8, 2024 · 综上，Linux大致实现了clocksource的管理框架，各个timer实现自己的drvier，并注册到clocksource中。 根据rating来看timer的性能：kvmclock>tsc>hpet>acpi_pm>pit。 3，kvmclock kvmclock比较特殊，是在kvm虚拟化的时候使用的，物理机上并没有---这也是和其他的timer很大的一个差别。 hemorrhagic fever outbreak in china 2022

【时间子系统】二、计时原理－timekeeper与clocksource

WebApr 8, 2024 · 综上，Linux大致实现了clocksource的管理框架，各个timer实现自己的drvier，并注册到clocksource中。 根据rating来看timer的性 … WebJan 25, 2024 · 本篇博文我们将深入分析一下内核是如何使用计时硬件对应用提供服务的。 1. 内核表示时间数据结构. 内核中对时间的表示有多种形式，可以使用在不同的应用场景。 WebMay 3, 2015 · Clocksource tsc was the one being used. Then I tried acpi=off option and found that there were only two clocksources, tsc jiffies. However, tsc was not unstable and still used as the main clocksource. Therefore the watchdog jiffies will not always deny tsc. I did the above experiment on a Dell desktop. hemorrhagic fever in uk