[chrony-users] chrony won't sync to gpsd

[Yan Seiner <yan@xxxxxxxxxx>]

I've been fighting this for a while, and I have no idea what I'm doing 
wrong.

First off, I have gpsd 2.94 that I am trying to use as a time source for 
chrony.

The platform is an embedded box with no RTC.  When it boots, I start 
gpsd, set the local clock to the current time using the gps signal, and 
then start chrony.

Sometimes chrony will sync to gpsd, sometimes it won't.  I can't find a 
pattern or anything useful to diagnose.

I'm sort of throwing things against a wall and seeing what sticks.  SHM0 
should work.  At least it has in the past.

chronyc> sources
210 Number of sources = 4
MS Name/IP address           Stratum Poll LastRx Last sample
============================================================================
#? SHM0                          0    4    10y     +0ns[   +0ns] +/-    0ns
#? SHM1                          0    4    10y     +0ns[   +0ns] +/-    0ns
#? GPS1                          0    4    10y     +0ns[   +0ns] +/-    0ns
#? SOC3                          0    4    10y     +0ns[   +0ns] +/-    0ns

Nov  6 18:12:13 anchor daemon.info chronyd[2728]: chronyd version 
1.25-pre1 starting
Nov  6 18:12:13 anchor daemon.info chronyd[2728]: Initial txc.tick=10000 
txc.freq=0 (0.00000000) txc.offset=0 => hz=100 shift_hz=7
Nov  6 18:12:13 anchor daemon.info chronyd[2728]: set_config_hz=0 hz=100 
shift_hz=7 basic_freq_scale=1.28000000 nominal_tick=10000 
slew_delta_tick=833 max_tick_bias=1000
Nov  6 18:12:13 anchor daemon.info chronyd[2728]: Linux kernel major=2 
minor=6 patch=32
Nov  6 18:12:13 anchor daemon.info chronyd[2728]: 
calculated_freq_scale=1.00000000 freq_scale=1.00000000

root@anchor:~# cat /etc/chrony/chrony.conf
# Chrony configuration

# Note: time servers and ntp client access is configured in 
/etc/config/ntpd
# and automatically set at startup

# Log clock errors above 0.5 seconds
logchange 0.5

# Allow command access only from localhost
cmdallow localhost
cmddeny

# Password config for chronyc
# Note: Using a command key other than "1" will break
# /etc/init.d/ntpd and /etc/hotplug.d/iface/20-ntpd
keyfile /etc/chrony/chrony.keys
commandkey 1

# delay 0.0 is right, but use 0.2 to avoid NMEA
# time fighting with PPS time
refclock SHM 0 offset 0.0 delay 0.2
refclock SHM 1 offset 0.0 delay 0.0
refclock SHM 1 poll 4 offset 0.0 refid GPS1

refclock SOCK /dev/gps

allow 0/0

--
Few people are capable of expressing with equanimity opinions which differ from the prejudices of their social environment. Most people are even incapable of forming such opinions.
   Albert Einstein


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