[ntp:questions] Performance estimation

David Taylor david-taylor at blueyonder.co.uk.invalid
Tue Jun 16 18:09:50 UTC 2020

On 16/06/2020 17:11, William Unruh wrote:
> The question then is how rapidly the system can respond to an
> interrupt,. This at least used to be of the order of a microsecond.
> Also, how logd does it take to read the clock with the kernel gettime
> routines. They all limit the accuracy of your clock using gps refclock > (and also how long the wire is between the gps unit and the computer)

I quick it more a question of variance rather than the absolute time, 
but I agree with your comment.  Again, with only microsecond reporting 
and today's processors it's difficult to measure.

To the latter, cable length, well under 5 nanoseconds!


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