[ntp:questions] Performance estimation

David Woolley david at ex.djwhome.demon.invalid
Wed Jun 17 11:02:23 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)

Also, does the Pi really use the full rate processor clock for real time 
measurement, and is there a slower synchronous logic clock associated 
with the interface  used to receive the external time source?

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