Re: [chrony-users] All network sources unusable

[Torsten Wolf <torsten.wolf@xxxxxxx>]

Bryan, many thanks for the explanation and the suggestion regarding 
SHM0. My only worry is that the sourcestats output is not offering much 
in terms of offset of the network sources:

$ chronyc sourcestats
Name/IP Address            NP  NR  Span  Frequency  Freq Skew  Offset  
Std Dev
==============================================================================
GPS 8   5   110   +444.701    259.006    +16ms  4453us
PPS 64  37  1011     -0.000      0.002     -1ns  1058ns
zeit.fu-berlin.de 0   0     0     +0.000   2000.000     +0ns  4000ms
ptbtime1.ptb.de 0   0     0     +0.000   2000.000     +0ns  4000ms
ptbtime2.ptb.de 0   0     0     +0.000   2000.000     +0ns  4000ms
ptbtime3.ptb.de 0   0     0     +0.000   2000.000     +0ns  4000ms
ns.tu-berlin.de 0   0     0     +0.000   2000.000     +0ns  4000ms

Cheers,
Torsten

Bryan Christianson schrieb am 03.06.23 um 23:18:
> Hi Torsten
>
>  From the chrony.conf(5) manpage:
> noselect Never select this source. This is useful for monitoring or with sources which are not very accurate, but are locked with a PPS refclock.
>
> Your 'noselect' hosts are not viable sources as they will never be selected. They will however show up in the 'chronyc sourcestats' list with their measured offsets.
>
> If you look at the gpsd link again, you will see they are displaying 'chronyc sourcestats', not 'sources' as you have posted.
>
> Also, I suggest you set the SHM 0 refclock to noselect - it will still be used by the pps refclock to give a timestamp to the pps readings but will not participate in setting the clock.
>
> I hope that helps.
>
> Regards, Bryan

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