NTP Performance

[ASSI]

Gary E. Miller via devel writes:
> There is a gpsd program in the contrib/ directory.  It tests your
> CPU granularity.  On a Raspberry Pi that is about 52 ns.  Worse
> on an Intel chip.

The actual granularity on RasPi can't be better than 52ns (the clock
it's based on is 19.2MHz) and you can determine it rather precisely
since you can read quite a bit faster than the clock actually ticks.  On Intel
it is typically around 17ns if you use TSC, but the clock it's based on
is 200MHz, so you read slower than the clock ticks.  If you use HPET as
the clock source (14.318MHz typically, although only specified as
>=10MHz), you'll see around 72ns granularity.


Regards,
Achim.
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