> One explanation would be an asymmetry in phc2sys. Synchronizing the > system clock to the PHC uses a more accurate method for measuring the > offset than synchronizing the PHC to the system clock. > > This asymmetry was fixed only recently after linuxptp-2.0 was > released. Have you tried phc2sys compiled from the latest sources in > git? Thanks for the hint. But after trying with an upgraded phc2sys and ptp4l from the master branch (they both say "2.0-00051-g450b1ed" when "-v") for 24h the result is even worse? (figure attached)
> Another explanation might a difference in the PPS signals. Do they > come from one GPS receiver, or are there two receivers (using the same > model, firmware, configuration and located at the same place)? They come from one single GPS receiver. Mino
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