On 8/20/2011 17:41, David Lord wrote:
My config for NetBSD-5.1 on i386:
# GPS Sure serial tty00 /dev/gps2
server 127.127.20.2 mode 18 prefer
fudge 127.127.20.2 time2 0.350 refid GPSb
server 127.127.22.2
fudge 127.127.22.2 flag2 0 flag3 1 refid PPSb
The Sure output is at a higher baud rate than default hence the
use of 'mode 18'.
offset
*GPS_NMEA(2) GPSb 0 377 -80.444 6.309
oPPS(2) PPSb 0 377 -0.013 0.004
Offset is normally lower than above but peaks at 25-30us when
system is under heavy load.
I've reconfigured like yours and tried it, too (with the addition of a
minpoll to speed up the GPS):
server 127.127.20.1 minpoll 4 mode 1 prefer
fudge 127.127.20.1 time2 0.245 refid GPS
server 127.127.22.1
fudge 127.127.22.1 flag2 0 flag3 1 refid PPS
But this is what ntpq gives me after a bit:
remote refid st t when poll reach delay offset
jitter
==============================================================================
*169.229.70.183 169.229.128.214 3 u 46 64 177 36.840 -5.794
0.280
+204.9.54.119 .CDMA. 1 u 38 64 177 73.723 -1.932
1.302
+127.127.20.1 .GPS. 0 l - 16 377 0.000 -13.713
7.456
127.127.22.1 .PPS. 0 l - 64 0 0.000 0.000
0.000
And the log files:
21 Aug 01:34:44 ntpd[7159]: 169.229.70.183 8011 81 mobilize assoc 2677
21 Aug 01:34:44 ntpd[7159]: 204.9.54.119 8011 81 mobilize assoc 2678
21 Aug 01:34:44 ntpd[7159]: GPS_NMEA(1) serial /dev/gps1 open at 4800 bps
21 Aug 01:34:44 ntpd[7159]: GPS_NMEA(1) 8011 81 mobilize assoc 2679
21 Aug 01:34:44 ntpd[7159]: PPS(1) 8011 81 mobilize assoc 2680
21 Aug 01:34:44 ntpd[7159]: 0.0.0.0 c016 06 restart
21 Aug 01:34:45 ntpd[7159]: 0.0.0.0 c012 02 freq_set kernel -74.006 PPM
21 Aug 01:34:45 ntpd[7159]: 169.229.70.183 8024 84 reachable
21 Aug 01:34:47 ntpd[7159]: 204.9.54.119 8024 84 reachable
21 Aug 01:34:47 ntpd[7159]: GPS_NMEA(1) 8024 84 reachable
21 Aug 01:37:58 ntpd[7159]: 169.229.70.183 963a 8a sys_peer
21 Aug 01:37:58 ntpd[7159]: 0.0.0.0 c615 05 clock_sync
21 Aug 01:38:00 ntpd[7159]: PPS(1) 802b 8b clock_event clk_no_reply
21 Aug 01:42:06 ntpd[7159]: ntpd exiting on signal 2
No reply from the PPS clock at all.
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