On 9/3/2011 22:21, unruh wrote:
On 2011-09-03, A C<agcarver+...@acarver.net> wrote:
I'm still digging through code for PPS and NMEA plus the routines in the
OS so that part is going to take a long time for me to figure out. So
for now I'm just going to stick with PPS only and the pool servers. As
for PPS itself, what is the proper (or at least most reasonable way) to
adjust the time1 offset so that PPS agrees with the tick of UTC?
And how would you decide what that offset was? Since the PPS is almost
certainly the most accurate time you have already.
(actually it is off by about 1us due to the interrupt handling.)
Well, after leaving ntpd running for about a week straight, six network
servers have settled down to report an average 2 ms offset (according to
ntpq). Each of the offsets is within about 0.5ms of each other. The
offset shown on PPS was 0.000 with a small amount of jitter.
I figured that if the entire collection of servers had settled into a
2ms offset then the tick of PPS was probably off by that amount.
If that's not a reasonable assumption then what would be?
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