| Re: [chrony-users] Help Chrony synchronization(connectivity) is lost after 10 to 15 minutes. |
[ Thread Index |
Date Index
| More chrony.tuxfamily.org/chrony-users Archives
]
William G. Unruh __| Canadian Institute for|____ Tel: +1(604)822-3273
Physics&Astronomy _|___ Advanced Research _|____ Fax: +1(604)822-5324
UBC, Vancouver,BC _|_ Program in Cosmology |____ unruh@xxxxxxxxxxxxxx
Canada V6T 1Z1 ____|____ and Gravity ______|_ www.theory.physics.ubc.ca/
On Tue, 9 Oct 2018, Munsif ALI wrote:
Miroslav lichvar thanks for the reponse.
I don't think it is a firmware bug in GPS because I have made a little program(using c++
language) which is receiving SIGIO signal via serial port and it continuously receiving GPS
and PPS data.
Since we have no idea what your little program is or what it does, it is
really hard to know what this means.
I have installed pps-tool, when I run ppstest /dev/pps0 command it is fetching data for 2 mints
and after that pps0 says connection time out error.
Which tells me that what is wrong has nothing to do with chrony, but is
further back along the chain. Either you have found a kernel bug, or you have
a defective gps receiver.
I don't know the actual problem why ppstest /dev/pps0 command stop receiving PPS data while I
am receiving SIGIO pulse in my program ?
_______________________________________________________________________________________________
From: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
Sent: Monday, October 8, 2018 3:44:11 PM
To: chrony-users@xxxxxxxxxxxxxxxxxxxx
Subject: Re: [chrony-users] Help Chrony synchronization(connectivity) is lost after 10 to 15
minutes.
On Mon, Oct 08, 2018 at 09:51:17AM +0000, Munsif ALI wrote:
> After 10 mints. The refclock log shows following output:
> 2018-10-08 09:32:32.375898 NEMA 0 N 0 -3.758982e-01 -3.758982e-01 1.000e-06
> 2018-10-08 09:32:33.000070 PPS 0 N 0 -6.974900e-05 -6.974948e-05 1.000e-09
> 2018-10-08 09:32:33.352441 NEMA 1 N 0 -3.524413e-01 -3.524413e-01 1.000e-06
> 2018-10-08 09:32:34.000011 PPS 1 N 0 -1.115700e-05 -1.115749e-05 1.000e-09
> 2018-10-08 09:33:25.828062 NEMA 6 N 0 5.199121e+04 5.199121e+04 1.000e-06
> 2018-10-08 09:33:26.819088 NEMA 7 N 0 5.199122e+04 5.199122e+04 1.000e-06
This is very strange. It looks like the time reported by the GPS
is suddenly off by ~14.4 hours.
> 2018-10-08 09:33:42.829835 NEMA 7 N 0 5.199121e+04 5.199121e+04 1.000e-06
> 2018-10-08 09:33:44.832557 NEMA 9 N 0 8.639983e+04 8.639983e+04 1.000e-06
And here it is almost exactly 24 hours off.
I think that indicates a firmware bug in the GPS. Is there a firmware
update you could apply?
I'd suggest to ask on the gpsd-users mailing lists and see if anyone
has experience with this device.
--
Miroslav Lichvar
--
To unsubscribe email chrony-users-request@xxxxxxxxxxxxxxxxxxxx
with "unsubscribe" in the subject.
For help email chrony-users-request@xxxxxxxxxxxxxxxxxxxx
with "help" in the subject.
Trouble? Email listmaster@xxxxxxxxxxxxxxxxxxxx.