On Thu, Jul 20, 2017 at 01:09:24PM +0200, Petr Kulhavy wrote:
> Now the situation has changed. The master is in sync with the
> SW-timestamping slave and the HW-timestamping slave is 37 seconds behind.
> Why is that?
I guess because your PHC on the GM is set to UTC and not TAI.
Normally, when implementing a GM, you will use a global time reference
like a GPS to discipline the PHC. If you don't have a good reference,
then you can set the PHC to TAI by hand like this.
#
# set phc to clock_realtime (utc)
#
testptp -s
#
# shift phc to tai
#
testptp -t 37
#
# check to see offset
#
testptp -g; date
If you want the PHC on the GM to track the local system time, then you
can run phc2sys on the GM like this.
phc2sys -a -r -r
(Note that -r is repeated.)
HTH,
Richard
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