ntpb a refclock

[Jindra Fucik]

Ahoj vespolek,

hraju si s referencnima hodinama pro ntpd - konkretne seriova gps.

Narazil jsem na pro mne nepochopitelne chovani. Pri jednom z pokusu vse 
fungovalo jak ma (viz CUT-1)
ovsem to bylo jen jednou. Beze zmeny konfigurace hned nasledujici spusteni 
konci s chybou (viz CUT-2)
Teda podle toho logu to neni az tak moc zrejme, ze to je chyba, ale podle 
ntpq se ten cas neakceptuje (viz CUT-3)
v konfiguraku nemam nic zasadniho (CUT-4) a do clockstats se taky pisou 
spravne udaje (CUT-5)

---------------------------------------- CUT-1 ------------------------
# ntpd -n -l /dev/stdout
 8 Apr 10:29:24 ntpd[31121]: logging to file /dev/stdout
 8 Apr 10:29:24 ntpd[31121]: ntpd 4.2.0-a Sun Feb 10 20:54:04 CET 2008 (1)
 8 Apr 10:29:24 ntpd[31121]: precision = 1.955 usec
 8 Apr 10:29:24 ntpd[31121]: no IPv6 interfaces found
 8 Apr 10:29:24 ntpd[31121]: kernel time sync status 2040
^C 8 Apr 10:32:06 ntpd[31121]: ntpd exiting on signal 2

-------------------------------------------------------------------------

---------------------------------------- CUT-2 ------------------------
# ntpd -n -l /dev/stdout
 8 Apr 10:50:39 ntpd[31551]: logging to file /dev/stdout
 8 Apr 10:50:39 ntpd[31551]: ntpd 4.2.0-a Sun Feb 10 20:54:04 CET 2008 (1)
 8 Apr 10:50:39 ntpd[31551]: precision = 1.955 usec
 8 Apr 10:50:39 ntpd[31551]: no IPv6 interfaces found
 8 Apr 10:50:39 ntpd[31551]: kernel time sync status 2040
 8 Apr 10:50:41 ntpd[31551]: clock GPS_NMEA(0) event 'clk_fault' (0x03)
 8 Apr 10:50:41 ntpd[31551]: clock GPS_NMEA(0) event 'clk_okay' (0x00)
 8 Apr 10:51:47 ntpd[31551]: clock GPS_NMEA(0) event 'clk_fault' (0x03)
 8 Apr 10:51:47 ntpd[31551]: clock GPS_NMEA(0) event 'clk_okay' (0x00)

-------------------------------------------------------------------------

---------------------------------------- CUT-3 ------------------------
# ntpq -c pe
     remote           refid      st t when poll reach   delay   offset 
jitter
==============================================================================
 cache1.sh.cvut. 195.113.144.201  2 u    6   64    1    6.013  -463.43 
0.002
 GPS_NMEA(0)     .PPS.            0 l    -   64    0    0.000    0.000 
4000.00

-------------------------------------------------------------------------

---------------------------------------- CUT-4 ------------------------
# cat /etc/ntp.conf
#
# put your default configuration (e.g. broadcastclient) in here
#
driftfile /var/ntp/ntp.drift
statsdir /var/ntp/stat/
server time.sh.cvut.cz
server 127.127.20.0 mode 3 prefer
fudge 127.127.20.0 time1 0.000 flag3 1 refid PPS
enable pps kernel stats monitor
logconfig +clockall
statistics clockstats peerstats

-------------------------------------------------------------------------

---------------------------------------- CUT-5 ------------------------
# tail /var/ntp/stat/clockstats
54564 31971.137 127.127.20.0 
$GPGGA,085250.000,5001.6872,N,01436.9492,E,0,00,,,M,,M,,*40
54564 32036.165 127.127.20.0 
$GPGGA,085355.000,5001.6872,N,01436.9492,E,0,00,,,M,,M,,*44
54564 32100.174 127.127.20.0 
$GPGGA,085459.000,5001.6872,N,01436.9492,E,0,00,,,M,,M,,*4F

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