[LinuxPPS] NTP not using PPS

[susmi sarah george]

hi,

thanks for reply.

i got following outputs, some info are coming related to PPS in log messages. i dont know whether my ntpd is taking PPS or not. so please conform it. 


[root at localhost log]# ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*GPS_NMEA(0)     .GPS.            0 l    8   16  377    0.000   -0.465   0.202
 LOCAL(0)        .LOCL.          10 l   14   64  377    0.000    0.000   0.004

ntpq> rv
assID=0 status=0464 leap_none, sync_uhf_clock, 6 events, event_peer/strat_chg,
version="ntpd 4.2.4p4 at 1.1520-o Thu Oct 25 13:00:43 UTC 2007 (3)",
processor="i686", system="Linux/2.6.23-rc2", leap=00, stratum=1,
precision=-18, rootdelay=0.000, rootdispersion=1.078, peer=40303,
refid=GPS, reftime=cacb3cbe.38d25261  Thu, Oct 25 2007 21:33:10.221,
poll=4, clock=cacb3cc7.781cd4b5  Thu, Oct 25 2007 21:33:19.469, state=4,
offset=-0.504, frequency=-143.248, jitter=0.154, noise=0.124,
stability=0.010, tai=0

if i give dmesg,the following things are coming,

PPS event on source 0 at at 1193327913.654233
capture assert seq #1971 for source 0
PPS_FETCH: source 0
timeout 0.000000000
PPS event on source 0 at at 1193327913.741394806
capture clear seq #1970 for source 0
PPS event on source 0 at at 1193327914.625905
capture assert seq #1972 for source 0
PPS_FETCH: source 0
timeout 0.000000000
PPS event on source 0 at at 1193327914.741394698
capture clear seq #1971 for source 0
PPS event on source 0 at at 1193327915.219633
capture assert seq #1973 for source 0
PPS_FETCH: source 0
timeout 0.000000000
PPS event on source 0 at at 1193327915.741394600
capture clear seq #1972 for source 0
PPS event on source 0 at at 1193327916.875436
capture assert seq #1974 for source 0
PPS_FETCH: source 0
timeout 0.000000000
PPS event on source 0 at at 1193327916.741394231
capture clear seq #1973 for source 0
PPS event on source 0 at at 1193327917.1083461
capture assert seq #1975 for source 0
PPS_FETCH: source 0
timeout 0.000000000


/var/log/messages

Oct 25 21:14:12 localhost ntpd[5114]: ntpd 4.2.4p4 at 1.1520-o Thu Oct 25 13:00:43 UTC 2007 (3)
Oct 25 21:14:12 localhost ntpd[5115]: precision = 3.000 usec
Oct 25 21:14:12 localhost ntpd[5115]: Listening on interface #0 wildcard, 0.0.0.0#123 Disabled
Oct 25 21:14:12 localhost ntpd[5115]: Listening on interface #1 wildcard, ::#123 Disabled
Oct 25 21:14:12 localhost ntpd[5115]: Listening on interface #2 lo, ::1#123 Enabled Oct 25 21:14:12 localhost ntpd[5115]: Listening on interface #3 eth0, fe80::230:64ff:fe05:581e#123 Enabled Oct 25 21:14:12 localhost ntpd[5115]: Listening on interface #4 lo, 127.0.0.1#123 Enabled
Oct 25 21:14:12 localhost ntpd[5115]: Listening on interface #5 eth0, 192.168.0.137#123 Enabled Oct 25 21:14:12 localhost ntpd[5115]: kernel time sync status 0040
Oct 25 21:14:12 localhost ntpd[5115]: logconfig: illegal argument  - ignored Oct 25 21:14:12 localhost ntpd[5115]: refclock_nmea: found GPS source "/dev/gps0"
Oct 25 21:14:12 localhost ntpd[5115]: refclock_nmea: try alternate PPS device "/dev/pps0"
Oct 25 21:14:12 localhost ntpd[5115]: refclock_nmea: found PPS source "/dev/pps0" Oct 25 21:14:12 localhost ntpd[5115]: refclock_nmea: time_pps_kcbind failed: Operation not supported Oct 25 21:14:12 localhost ntpd[5115]: frequency initialized -142.639 PPM from /var/lib/ntp/drift
Oct 25 21:14:12 localhost ntpd[5115]: system event 'event_restart' (0x01) status 'sync_alarm, sync_unspec, 1 event, event_unspec' (0xc010)
Oct 25 21:14:13 localhost ntpd[5115]: peer GPS_NMEA(0) event 'event_reach' (0x84) status 'unreach, conf, 1 event, event_reach' (0x8014)
Oct 25 21:14:14 localhost ntpd[5115]: peer LOCAL(0) event 'event_reach' (0x84) status 'unreach, conf, 1 event, event_reach' (0x8014)
Oct 25 21:15:04 localhost ntpd[5115]: system event 'event_peer/strat_chg' (0x04) status 'sync_alarm, sync_uhf_clock, 2 events, event_restart' (0xc421)
Oct 25 21:15:04 localhost ntpd[5115]: synchronized to GPS_NMEA(0), stratum 0
Oct 25 21:15:04 localhost ntpd[5115]: time reset -0.259552 s
Oct 25 21:15:04 localhost ntpd[5115]: kernel time sync status change 0001
Oct 25 21:15:04 localhost ntpd[5115]: system event 'event_clock_reset' (0x05) status 'sync_alarm, sync_unspec, 3 events, event_peer/strat_chg' (0xc034)
Oct 25 21:15:30 localhost ntpd[5115]: peer GPS_NMEA(0) event 'event_reach' (0x84) status 'unreach, conf, 2 events, event_reach' (0x8024)
Oct 25 21:15:30 localhost ntpd[5115]: peer LOCAL(0) event 'event_reach' (0x84) status 'unreach, conf, 2 events, event_reach' (0x8024)
Oct 25 21:16:19 localhost ntpd[5115]: system event 'event_peer/strat_chg' (0x04) status 'sync_alarm, sync_uhf_clock, 4 events, event_clock_reset' (0xc445)
Oct 25 21:16:19 localhost ntpd[5115]: synchronized to GPS_NMEA(0), stratum 0
Oct 25 21:16:19 localhost ntpd[5115]: system event 'event_sync_chg' (0x03) status 'leap_none, sync_uhf_clock, 5 events, event_peer/strat_chg' (0x454)
Oct 25 21:16:19 localhost ntpd[5115]: system event 'event_peer/strat_chg' (0x04) status 'leap_none, sync_uhf_clock, 6 events, event_sync_chg' (0x463)

i got following outputs for ntptime. but no info about PPS_Frequency,PPS_SYNC etc?

[root at localhost log]# ntptime
ntp_gettime() returns code 0 (OK)
  time cacb3d08.51d0c000  Thu, Oct 25 2007 21:34:24.319, (.319592),
  maximum error 4321 us, estimated error 111 us
ntp_adjtime() returns code 0 (OK)
  modes 0x0 (),
  offset -457.000 us, frequency -143.285 ppm, interval 1 s,
  maximum error 4321 us, estimated error 111 us,
  status 0x1 (PLL),
  time constant 4, precision 1.000 us, tolerance 512 ppm,

So, please tell me what to do next.if its ok how to check  accuracy?


thanks,
lola



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