[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 



More information about the questions mailing list