Re: [chrony-users] time sync query

[Bill Unruh <unruh@xxxxxxxxxxxxxx>]

On Mon, 7 Aug 2017, Jahagirdar, Bhushan wrote:

> Hi,
>
>  
>
> I am using chrony stable 3.1 version.
>
>  
>
> Below is my cfg:
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> #For GPS data feed
>
> refclock SOCK /var/run/chrony.ttyS1.sock poll 2 refid GPS maxsamples 4 prefer
>
> #For CAN data feed
>
> refclock SOCK /var/run/chrony.ttyS2.sock poll 2 delay 0.5 refid CAN maxsamples 5

No idea what CAN  data feed is.

>  
>
> #target is one hop reachable
>
> local stratum 1
You have this why? A refclock is stratum 0. A clock that gets its time from a
refclock is stratum 1. Why are you putting this into the confic file.


>  
>
> keyfile /etc/chrony/chrony.keys
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>  
>
> makestep 0.01 -1
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>  
>
>  
>
>  
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> Below is the chrony sources o/p:
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>  
>
> 210 Number of sources = 2
>
>  
>
>   .-- Source mode  '^' = server, '=' = peer, '#' = local clock.
>
> / .- Source state '*' = current synced, '+' = combined , '-' = not combined,
>
> | /   '?' = unreachable, 'x' = time may be in error, '~' = time too variable.
>
> ||                                                 .- xxxx [ yyyy ] +/- zzzz
>
> ||      Reachability register (octal) -.           |  xxxx = adjusted offset,
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> ||      Log2(Polling interval) --.      |          |  yyyy = measured offset,
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> ||                                \     |          |  zzzz = estimated error.
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> ||                                 |    |           \
>
> MS Name/IP address         Stratum Poll Reach LastRx Last sample
>
> ===============================================================================
>
> #? GPS                           0   2   377     2   -4509h[ -4509h] +/-  6567m
>
> #? CAN                           0   2     0     -     +0ns[   +0ns] +/-    0ns
>
>  
>
>  
>
> My query:
>
> Although I have given makestep 0.01 -1 and maxsample for GPS refclock is set to 4, I am still not able to see the synch
> happening.

You have two sources. If there is a disagreeement chrony has no way of know
ing which is correct, making it impossible to decidee on a source.

Also what is your GPS? Is it supposed to be a PPS? They you need to have some
other source to give what second that pps refers to.

> I am feeding offset data to GPS refclock for every 1 sec.

How?

Note that it says that gps is  over 4000 hours out.

I think that there is something very wrong is whatever is feeding time to the
SOCK.


> Can you please suggest any configuration changes here. However sometimes it works.
>
> Similar issue I am finding in chrony 2.2 thatʼs where I thought of testing with 3.1 if this has to do with some bug.
>
>  
>
> --
>
> Thanks and Regards,
>
> Bhushan J.
>
>