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| faq:start [2013/07/16 23:33] – the_aviv | faq:start [2015/11/16 11:02] – [Q: What about timers and timing ?] 202.77.55.169 | ||
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| ==== Q: What about timers and timing ? ==== | ==== Q: What about timers and timing ? ==== | ||
| - | Modern PCs provide good hardware timing sources. | + | For moderate to new hardware, TSC is the best hardware timing sources. |
| - | One of it is the RTC (real-time-clock). Another one is the HPET (high-precision-event-timer), which is preferable | + | |
| Then there is a software layer (in the kernel) to make available the hw-timers to the applications, | Then there is a software layer (in the kernel) to make available the hw-timers to the applications, | ||
| One example is the usual system-timer. | One example is the usual system-timer. | ||
| Line 59: | Line 58: | ||
| (see: priority settings, rtirq). | (see: priority settings, rtirq). | ||
| - | **How to know, if a HPET (hardware) is available? | + | **How to know, if a TSC / HPET (hardware) is available? |
| + | dmesg | grep -i tsc | ||
| dmesg | grep -i hpet | dmesg | grep -i hpet | ||
| Line 65: | Line 65: | ||
| cat / | cat / | ||
| - | **Related Kernel Options | + | **How to config kernel for HPET?** |
| < | < | ||
| # cat .config | grep -i hpet | # cat .config | grep -i hpet | ||
| Line 85: | Line 85: | ||
| Related Articles: | Related Articles: | ||
| [[http:// | [[http:// | ||
| + | [[http:// | ||