[ntp:questions] Can NTP sync within 1ms

Rob nomail at example.com
Tue Apr 29 15:51:29 UTC 2014

William Unruh <unruh at invalid.ca> wrote:
> The problem is not the electronics, it is the response of the system to
> the interrupt. That interrupt processing time is in the usec range.

This does not really matter when it is constant.
And my experience is that the jitter on the PPS refclock is usually
0, 1 or 2us when I check it.
On a newer server that has just been configured for this task it is
the same:
     remote           refid      st t when poll reach   delay   offset  jitter
oPPS(0)          .PPS.            0 l   16   16  377    0.000   -0.001   0.001

(the GPSDO is still synchronizing, things may be even better after that)

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