Re: Clock drift and other open issues: Collecting information

[Johnny Billquist <bqt%softjar.se@localhost>]

On 2023-12-27 09:55, Martin Husemann wrote:
> On Wed, Dec 27, 2023 at 09:52:41AM +0100, Johnny Billquist wrote:
> > Are you sure it is synced? I haven't even seen how I could see that with
> > ntpq. I had to enable ntpdc to get more information, and there I can see
> > that it isn't syncing.
> > How are you telling that it is syncing?
>
> "ntpq -p" lists all peers/servers and marks the synced ones with a *

Oh, it does? Well, since I don't get any syncing, I'm not seeing that. :-)
ntpdc would also show that, but it also shows a different character when 
not synced. ntpq just shows nothing, so I couldn't tell.
Thanks.

On my 4000/90, I can see that the offset moves around at every polling 
of ntp servers. It is basically moving between -.5 and +.5 all the time, 
even just between two polls. Which is quite a lot, and I don't 
understand how it can be that bad. But I would suspect that is the 
reason it never starts syncing. Dispersion is just too bad.

Also, output is slightly weird/different between ntpq and ntpdc.

Like this:

Gnat:/usr/src# ntpq -p
     remote           refid      st t when poll reach   delay   offset 
jitter
==============================================================================
 1.netbsd.pool.n .POOL.          16 p    -   64    0    0.000   +0.000 
1000.00
 46.140.15.108   .NMEA.           1 u   54   64  377  1000.00  +329.96 
1000.00
 skitty.itu.ch   210.65.119.71    2 u   35   64  377  1000.00  +583.93 
1000.00
 delcatty.itu.ch 195.176.26.205   2 u   41   64  377  1000.00  +514.12 
1000.00
 time.sunrise.ne .GNSS.           1 u   65   64  377  1000.00  +274.12 
1000.00
 ntp3.home4u.ch  251.4.108.178    2 u   37   64  377  1000.00  +561.95 
1000.00
Gnat:/usr/src# ntpdc -p
     remote           local      st poll reach  delay   offset    disp
=======================================================================
=ntp3.home4u.ch  192.168.1.12     2   64  377 1.00000 +0.016987 0.99854
=time.sunrise.ne 192.168.1.12     1   64  377 1.00000 -0.183237 0.99855
=delcatty.itu.ch 192.168.1.12     2   64  377 1.00000 -0.114089 0.99854
=skitty.itu.ch   192.168.1.12     2   64  377 1.00000 -0.108027 0.99852
=46.140.15.108   192.168.1.12     1   64  377 1.00000 -0.337411 0.99852
=0.0.0.0         0.0.0.0         16   64    0 0.00000 +0.000000 4.00000
Gnat:/usr/src#


Not sure if anyone else sees something similar. (Note that delay seems 
to not work, and jitter in ntpq also seems to not work.)

  Johnny

--
Johnny Billquist                  || "I'm on a bus
                                  ||  on a psychedelic trip
email: bqt%softjar.se@localhost             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol