"David J Taylor" <david-tay...@blueyonder.not-this-part.nor-this.co.uk.invalid> writes:
>Unruh wrote: >> "David J Taylor" >[] >>> On my system, I can detect no difference between the GPS 18 and the >>> GSP 18x. I am looking at jitters in the order of 2.2 microseconds, >>> and offsets in the range +170/-100 microseconds. >> >> How are you reading the PPS interrupts>. That offset is terrible. On >> my PPS feeding a parallel interrups, the offsets are less than 10us. >This is a Windows system, Bill. I know I would do far better with a >FreeBSD system (I used to get better than 20microsecond offsets), but I'm >able to run one PC less now, by having a Windows PC as my stratum-1 >server. OK, I keep forgetting. What accuracy can the clock be read on windows? is there an interpolation routine in the kernel so the clock can be read to usec accuracy? I would thin k you could set up and interrupt routine to read and record the clock time when the interrupt occurs. >The offset is more than good enough for my purposes. >Cheers, >David _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
