Re: [chrony-users] Not getting time from gpsd

[Chris Greenman <chris.m.greenman@xxxxxxxxx>]

Ok   I took out the offset, precision, and delay.  I let everything stabilize a bit and then took 3 samples.   Here's what it came up with.  

$ date && chronyc sources

Tue  9 Aug 08:54:52 EDT 2016

210 Number of sources = 5

MS Name/IP address         Stratum Poll Reach LastRx Last sample               

===============================================================================

#* GPS                           0   4   377    15  +1479us[+1575us] +/-  522us

^? clockb.ntpjs.org              0   6     0     -     +0ns[   +0ns] +/-    0ns

^- proxmox.undeadarmy.com        2   6     7     8    -63ms[  -63ms] +/-   87ms

^- host2.kingrst.com             2   6     7     9    -72ms[  -72ms] +/-   91ms

^- clock.xmission.com            1   6     7     8    -65ms[  -65ms] +/-   41ms

irishmistii@IrishMistII:~ $ date && chronyc sources

Tue  9 Aug 08:55:00 EDT 2016

210 Number of sources = 5

MS Name/IP address         Stratum Poll Reach LastRx Last sample               

===============================================================================

#* GPS                           0   4   377    12   -606us[-1568us] +/-  422us

^? clockb.ntpjs.org              0   6     0     -     +0ns[   +0ns] +/-    0ns

^- proxmox.undeadarmy.com        2   6     7    16    -62ms[  -63ms] +/-   87ms

^- host2.kingrst.com             2   6     7    16    -71ms[  -72ms] +/-   91ms

^- clock.xmission.com            1   6     7    16    -64ms[  -65ms] +/-   41ms

irishmistii@IrishMistII:~ $ date && chronyc sources

Tue  9 Aug 08:55:08 EDT 2016

210 Number of sources = 5

MS Name/IP address         Stratum Poll Reach LastRx Last sample               

===============================================================================

#* GPS                           0   4   377    20   -606us[-1568us] +/-  422us

^? clockb.ntpjs.org              0   6     0     -     +0ns[   +0ns] +/-    0ns

^- proxmox.undeadarmy.com        2   6     7    24    -62ms[  -63ms] +/-   87ms

^- host2.kingrst.com             2   6     7    25    -71ms[  -72ms] +/-   91ms

^- clock.xmission.com            1   6     7    24    -64ms[  -65ms] +/-   41ms

On Tue, Aug 9, 2016 at 8:10 AM, Chris Greenman <chris.m.greenman@xxxxxxxxx> wrote:

Thanks.  I already enabled my NTP sources and you're right, the gps is getting marked as bad.  I'll play with that today.

Chris

On Aug 9, 2016 4:42 AM, "Miroslav Lichvar" <mlichvar@xxxxxxxxxx> wrote:

On Mon, Aug 08, 2016 at 01:21:56PM -0400, Chris Greenman wrote:
> 210 Number of sources = 1
> MS Name/IP address         Stratum Poll Reach LastRx Last sample
>
> ===============================================================================
> #* GPS                           0   4   377    17   +296us[ +347us] +/-
>  200ms
>
>
> I am perfectly happy with 200ms error in time.   That more than suits my
> needs.

You might want to try this with some NTP sources and see how accurate
is the GPS time source. From that you would adjust the offset value on
the refclock SHM line so the the error is reduced and the GPS source
is not marked as a falseticker when there are other source. I'd also
suggest to add "minsamples 64" to the refclock directive, so chronyd
doesn't try to follow short-term variations in the measured offset
(the error in the message based GPS time tends to be non-random).

--
Miroslav Lichvar

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