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

Alby VA albyva at empire.org
Thu Mar 8 02:41:40 UTC 2012


On Mar 7, 3:51 pm, David Lord <sn... at lordynet.org> wrote:
> Alby VA wrote:
> > On Mar 7, 11:59 am, David Lord <sn... at lordynet.org> wrote:
> >> 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:
> >>> [a... 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
> >>> [a... 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
>
> >  Does this mean there is something I need to tweek to get
> > my offsets lower? Could the delays from the remote NTP
> > servers be my issue?
>
> I don't know if that's the case. I setup my two servers
> to use the nearest ntp servers that didn't share the same
> sources. There are tools to assist in the ntp distribution
> or you can select from the list of public servers at
> ntp.org. The stratum is usually of no importance. I had
> several stratum3 servers in my initial selection but the
> same servers are now stratum2 or stratum1. By nearest, I
> mean those with shortest delay.
>
> I'd remove the sources with highest delay, maybe just by
> marking as noselect.
>
> My own server with gps/pps source gives a couple of blips
> each morning due to load from cron jobs. The other pcs
> show variations from load and from temperature.
>
> http://www.lordynet.org.uk/mrtg/stats/ntp/
>
> David



 David:

 Can I get your mrtg.cfg and perl script for those graph/stats?
I think mine are just mislabeled...



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