[ntp:questions] stupid, simple question about precision
ssimon at domain.invalid
Mon Nov 20 22:46:16 UTC 2006
rgilbert88 at comcast.net wrote...
> David J Taylor wrote:
> > Simple Simon wrote:
> > 
> >>My understanding is the best accuracy I might get, on a generic PC
> >>clock, is about 0.050 ms--and that's with SSP and the kernel clock.
> > My really old 133MHz Pentium PC with FreeBSD and a PPS source (with an
> > incomplete view of the sky) does a little better than than. I'm sure more
> > modern hardware and a better-positioned GPS antenna would do substantially
> > better.
> > http://www.david-taylor.myby.co.uk/mrtg/pixie_ntp.html
> > http://www.david-taylor.myby.co.uk/ntp/FreeBSD-GPS-PPS.htm
> > Cheers,
> > David
> I haven't tried it with a PC but a ~10 year old Sun Ultra 10 with a 440
> MHz processor and Solaris 8 keeps time within a couple of microseconds.
> I do have a good view of the sky. Something blazingly fast with a
> lower interrupt latency might do still better but my modest hardware
> meets and exceeds my very modest needs.
Is your GPS directly updating your hardware, or is your SPARC an NTP
client of a Stratum 1 timeserver connected to the GPS, or... ?
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