[ntp:questions] Assistance with PPS on Windows

unruh unruh at wormhole.physics.ubc.ca
Fri May 6 01:07:01 UTC 2011

On 2011-05-05, E-Mail Sent to this address will be added to the BlackLists <Null at BlackList.Anitech-Systems.invalid> wrote:
> unruh wrote:
>> Uh, no. There is no way of getting the signal into the
>>  computer with nanosecond accuracy. 1usec is about it.
>> The interrupt service routines, if you use a specialised
>>  driver for some interrupt driven card, will take about
>>  1usec to service the interrupt.
> IIRC some BSD variants were claiming to get ~<150ns?

I do not believe that you can service an interrupt, and read a system clock
that quickly. If you have specialised hardware on the PC (as someone
suggested, a card with a counter on it which is switched on when the
signal comes in) perhaps. 


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