[ntp:questions] large dispersion
Dave
dave.deconsulting at gmail.com
Thu May 24 21:17:07 UTC 2007
On May 23, 1:16 pm, "Richard B. Gilbert" <rgilber... at comcast.net>
wrote:
> Dave wrote:
> > I'm experiencing large values of dispersion when I use 'ntpq -p':
>
> > 3:22pm:ntp>ntpq -p
> > remote refid st t when poll reach delay
> > offset disp
> > ==============================================================================
> > *10.2.100.10 .GPS. 1 u 25 64 377 0.46
> > 943.557 439.36
> > 3:22pm:ntp>
>
> > but when I look at the peerstats log file, my dispersion is low:
>
> > 3:22pm:ntp>tail /var/ntp/ntpstats/peerstats.log
> > 54243 54804.018 10.2.100.10 9634 0.617563 0.00046 0.31154
> > 54243 54868.013 10.2.100.10 9634 0.813226 0.00043 0.32210
> > 54243 54932.018 10.2.100.10 9634 0.099169 0.00046 0.55225
> > 54243 54996.010 10.2.100.10 9634 0.300057 0.00047 0.28690
> > 54243 55060.014 10.2.100.10 9634 0.584358 0.00044 0.31111
> > 54243 55124.009 10.2.100.10 9634 0.781632 0.00047 0.32353
> > 54243 55188.014 10.2.100.10 9634 0.065932 0.00043 0.55287
> > 54243 55252.013 10.2.100.10 9634 0.657674 0.00044 0.37859
> > 54243 55316.018 10.2.100.10 9634 0.943557 0.00046 0.43936
> > 54243 55380.013 10.2.100.10 9634 0.139388 0.00044 0.59772
> > 3:23pm:ntp>
>
> > I'm also concerned with the large amount of maximum/estimated error
> > when I use the xntpdc command 'kerninfo':
>
> > xntpdc> kerninfo
> > pll offset: 0 us
> > pll frequency: -391.137 ppm
> > maximum error: 524704 us
> > estimated error: 408368 us
> > status: 0089
> > pll time constant: 2
> > precision: 1 us
> > frequency tolerance: 512 ppm
> > pps frequency: 0.000 ppm
> > pps stability: 512.000 ppm
> > pps jitter: 200 us
> > calibration interval: 4 s
> > calibration cycles: 0
> > jitter exceeded: 0
> > stability exceeded: 0
> > calibration errors: 0
> > xntpdc>
>
> > Here is the output of the pstats command:
>
> > xntpdc> pstats 10.2.100.10
> > remote host: 10.2.100.10
> > local interface: 10.2.100.5
> > time last received: 3s
> > time until next send: 61s
> > reachability change: 2947s
> > packets sent: 59
> > packets received: 59
> > bad authentication: 0
> > bogus origin: 0
> > duplicate: 0
> > bad dispersion: 15
> > bad reference time: 0
> > candidate order: 1
> > xntpdc>
>
> > And lastly, my ntp.conf file:
>
> > 3:25pm:inet>more ntp.conf
> > server 10.2.100.10 # NTP server
>
> > driftfile /etc/ntp.drift # Drift available for next restart
> > logfile /var/ntp/ntp.log # NTP logging
>
> > statsdir /var/ntp/ntpstats/
> > statistics loopstats peerstats clockstats
> > filegen loopstats file loopstats.log type day link enable
> > filegen peerstats file peerstats.log type day link enable
> > filegen clockstats file clockstats.log type day link enable
> > 3:25pm:inet>
>
> > Anyone have any ideas? I have a GPS signal coming in to a Brandywine
> > NTA-100, which is configured at 10.2.100.10. Thanks in advance!
>
> If you are using "X"ntpdc you would appear to be using a version that
> may be as much as ten years old! Just what are you using and what are
> you running it on?
Wow you're right. Heres the version printout:
xntpdc 3-5.93e Mon Sep 20 15:47:24 PDT 1999 (1)
I'm running this on a Sun Fire 4200, Solaris 10. Something this old
comes installed on Solaris 10?
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