To Yap Tse [EIE] wrote: > Jan, > > do you mean that even the rtping resolution is nanosecond, but the > hardware/software limits the accuracy to micosecond? > > Can I use the TSC as the time source instead of somthing likes 8254.
The problem is not the clock source (which is normally TSC anyway), but predominantly the jitter of any interrupt-driven event (like "some packet just arrived") on both sides. So, if you want to measure the end-to-end round-trip that is achievable in software (e.g. with RTnet as-is), looking for nanoseconds is of limited use. If there were some low-jitter black-box on the other side whose responsiveness you want to analyse, then it would make sense to look for better means to measure the /real/ (hardware) round-trip. Jan
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