On Fri, 3 Nov 2000, Poul-Henning Kamp wrote:
> In message <Pine.SOL.4.21.0011031156050.29568-100000@jade>, Zhiui Zhang writes:
> >
> >The manual says the granularity of gettimeofday() is hardware dependent.
> >The time may be updated continuously or in clock ticks. Can anyone
> >explain for me the two different ways of updating the time? What kind of
> >hardware can help?
>
> You probably need to tell me what you need first...
This is actually a question from the book "Kernel Project for Linux" and I
am a TA for an operating system course that uses this textbook. I know a
little bit of NTP and Intel Time stamp counter. I need an authoritive
answer for this question because I do not have the time to go through the
FreeBSD code to find out myself in a short time. My impression is that if
the time is updated by an interrupt handler per tick, it can not get a
microsecond granularity.
-Zhihui
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