[ntp:questions] Second attempt at GPS-18 based NTP server
David J Taylor
david-taylor at blueyonder.co.uk.invalid
Fri Feb 3 15:55:41 UTC 2012
> The need to make a custom kernel that includes option PPS_SYNC is
> still true on the recently released FreeBSD 9.0.
>
> Tom
Thanks, Tom. I'm not familiar with FreeBSD 8.0, but looking at the
revision dates on some files it appears that I /may/ have recompiled the
kernel. Difficult for me to tell, though. This is what I see:
______________________________
C:\>ntpdc -c kerninfo pixie
pll offset: -0.00234 s
pll frequency: 27.835 ppm
maximum error: 0.008483 s
estimated error: 2e-006 s
status: 2107
pll time constant: 4
precision: 1e-006 s
frequency tolerance: 496 ppm
pps frequency: 27.835 ppm
pps stability: 0.007 ppm
pps jitter: 0.00274 s
calibration interval: 256 s
calibration cycles: 160784
jitter exceeded: 30488
stability exceeded: 0
calibration errors: 11
______________________________
C:\>ntpq -p pixie
remote refid st t when poll reach delay offset
jitter
==============================================================================
*GPS_NMEA(1) .PPS. 0 l 6 16 377 0.000 0.001
0.004
-odie.tomelliott 158.43.128.33 2 u 746 1024 377 23.658 3.961
7.972
-dnscache-london 140.203.204.77 2 u 845 1024 377 27.784 0.433
18.409
195.66.148.150 140.203.204.77 2 u 370d 1024 0 25.383 3.955
0.000
______________________________
so perhaps I did. I don't see the "o" of the Atom driver, though.
Cheers,
David
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