Puzzling clock offset spikes
hmurray at megapathdsl.net
Sat Jun 30 07:26:36 UTC 2018
What's in your ntp.conf?
You might try increasing any maxpolls if they are less than 6. It's likely to
make the normal case worse, but if the spikes get better that might tell
Do you have full logging?
logconfig =syncall +clockall +peerall +sysall
There might be something interesting in there.
You might try putting all the log files into a memory file system. Maybe the
disk writes are disabling interrupts long enough to cause troubles. Or try a
USB hard drive.
If you run out of other ideas, try without gpsd. Use the NMEA and PPS drivers.
> I have a thin, closed-cell insulation sheet affixed to the back of the GPS
> hat to slow temp variations coming from the Raspi itself
The temperature of the GPS isn't important. Time comes from the crystal that
drives the CPU. I think it's on the bottom of the board.
These are my opinions. I hate spam.
More information about the users