[ntp:questions] Peer Review of ntpq -c rv

David Lord snews at lordynet.org
Wed Mar 7 16:59:31 UTC 2012


Alby VA wrote:
> On Mar 7, 10:59 am, David Lord <sn... at lordynet.org> wrote:
>> Alby VA wrote:
>>>  I'm looking to get a little feedback on if the following output of my
>>> Sure GPS / FreeBSD
>>> setup looks like its running smoothly and keeping time correctly.
>>> assID=0 status=0115 leap_none, sync_atomic, 1 event,
>>> event_clock_reset,
>>> version="ntpd 4.2.... at 1.2349-o Mon Feb 20 22:00:33 UTC 2012 (1)",
>>> processor="amd64", system="FreeBSD/9.0-RELEASE", leap=00, stratum=1,
>>> precision=-19, rootdelay=0.000, rootdisp=0.269, refid=PPS,
>>> reftime=d301d22f.dc1393c2  Wed, Mar  7 2012  7:25:19.859,
>>> clock=d301d230.cc08bad9  Wed, Mar  7 2012  7:25:20.797, peer=41909,
>>> tc=4, mintc=3, offset=-0.034, frequency=-25.214, sys_jitter=0.002,
>>> clk_jitter=0.002, clk_wander=0.001
>>>  Here are my website graphs/stats I've been keeping since day 1.
>>> NTP Clock Offset:http://godzilla.empire.org:9999/
>>> NTP Offset from UTC:http://godzilla.empire.org:9999/godzilla_ntp-b.html
>> Could you also post output from ntpq -p
>>
>> I don't have a pc with recent FreeBSD but the desktop
>> I updated to NetBSD-6 only 2 hours ago gives:
>>
>> remote                refid        st t poll reach delay offset jitter
>> +ntp1.lordynet.org    81.187.61.74  2 u  512   377 0.450 -4.961  3.024
>> *ntp0.lordynet.org.uk .MSFa.        1 u  512   377 0.642 -0.828  4.785
>> +<local pc>           .PPSb.        1 u  512   377 1.572 -1.935  3.187
>> -<local pc2>          81.187.61.74  2 u  512   377 1.553 -6.075  3.892
>>
>> Does the Sure have a PPS output you can use?
>>
>> <Local pc> is using a Sure with PPS
>> # ntpq -c rv -p me6000
>> associd=0 status=0119 leap_none, sync_pps, 1 event, leap_armed,
>> version="ntpd 4.2.6p5....",
>> processor="i386", system="NetBSD/5.1_STABLE",
>> .....
>> offset=-0.001 sys_jitter=0.004
>>
>> David
> 
> 
> 
> 
> Here is my ntpq -p  output:
> 
> 
> [alby at godzilla.empire.org(tcsh):6] ntpq -p
>      remote           refid      st t when poll reach   delay
> offset  jitter
> ==============================================================================
> -ntp.alaska.edu  .GPS.            1 u  133  128  377  120.428
> -2.464   0.371
> +utcnist2.colora .ACTS.           1 u   53  128  377   66.362
> -4.215   0.429
> -time-a.nist.gov .ACTS.           1 u  670  128  240   16.473
> 2.627  17.066
> +tick.usask.ca   .GPS.            1 u  110  128  377  104.848
> -3.473   1.482
> -cronos.cenam.mx .GPS.            1 u   49  128  377  100.163
> 10.784  27.096
> oPPS(0)          .PPS.            0 l    6   16  377    0.000
> -0.018   0.002
> *GPS_NMEA(0)     .GPSb.           0 l    9   16  377    0.000
> -36.164  18.050
> [alby at godzilla.empire.org(tcsh):7]
> 

Sorry I misread your message and had in my mind that you
were getting msec offsets rather than usec. I canceled my
reply after posting.

The offsets still look to be high for what can be achieved
from pps but are not reflected in the jitter.


David




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