Alby VA wrote:
On Mar 13, 8:27 am, David Lord <sn...@lordynet.org> wrote:
.....
I've not noticed any significant difference after swapping to use only NMEA driver as from March 2, 2012. Also version of ntpd I was using in 2008/2009 didn't have nmea driver with support for PPS. NetBSD-5 Garmin 18X-LVC used from 2009 to March 2011. Sure GPS used from March 2011 to date. Serial cable length was extended by about 17m to confirm that working over that distance would not be a problem. Atom driver used from 2009 /etc/ntp.conf.11122702 ############# 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 GPSb ############# peerstats.20120108 ident cnt mean rms max delay dist disp ========================================================================== 127.127.20.2 1350 -63.925 14.862 50.035 0.000 2.408 1.722 127.127.22.2 1350 0.000 0.003 0.030 0.000 0.928 0.928 loopstats.20120108 loop 1350, 7+/-24.0, rms 3.4, freq -35.89+/-0.159, var 0.078 /etc/ntp.conf.12030801 ############# server 127.127.20.2 mode 18 fudge 127.127.20.2 time2 0.410 flag1 1 flag2 0 flag3 1 refid GPSb ############# peerstats.20120312 ident cnt mean rms max delay dist disp ========================================================================== 127.127.20.2 1350 0.000 0.003 0.028 0.000 0.928 0.928 loopstats.20120312 loop 1350, 3+/-25.1, rms 3.3, freq -35.13+/-0.204, var 0.054 DavidI'll say there has been an improvement, but does this look weird? What is (oGPS_NMEA) telling me? NOTES: (Yes I know, I need to increase the minpoll on remote servers.) ------------ remote refid st t when poll reach delay offset jitter ============================================================================== utcnist2.colora .ACTS. 1 u 57 64 11 56.500 2.475 2.852 +ntp.alaska.edu .GPS. 1 u 1 64 357 113.075 -0.537 1.467 -tick.usask.ca .GPS. 1 u 40 64 377 95.721 -8.491 0.737 +cronos.cenam.mx .GPS. 1 u 5 64 377 88.488 -2.094 1.823 *ntp1.usno.navy. .USNO. 1 u 47 64 377 20.605 2.849 4.014 -time-a.nist.gov .ACTS. 1 u 2 64 203 84.047 38.336 38.109 oGPS_NMEA(0) .PPS. 0 l 7 16 377 0.000 0.002 0.002
That seems to be working ok. The NMEA sentences aren't being reported because PPS is being used to condition the system clock. David
Peerstats Before/After: [day, second, address, status, offset, delay, dispersion, skew (variance)] --- Before: 55999 1.493 127.127.20.0 914b -0.015715484 0.000000000 0.002563345 0.023433975 After: 55999 48104.873 127.127.20.0 975a 0.000001154 0.000000000 0.000233462 0.000001907 Offset Before: -0.015715484 Offset After: 0.000001154 This is my current /etc/ntp.conf file (parsed): -- # server 127.127.20.0 mode 18 minpoll 4 maxpoll 4 prefer fudge 127.127.20.0 flag1 1 flag3 1 refid PPS #
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