On Sun, Jun 09, 2019 at 03:31:32AM +0200, Mino Sharkhawy wrote: > > > What happens when you swap the master/slave roles? Does the offset > > > change? Only the sign, or also the absolute value? > > Good idea! I'll give it a try as soon as I can. > > So I swapped the master/slave roles and let it run for another 48 hours. > Both sign and absolute value changed... > > I have attached histograms of the offsets measured both with regular and > reversed master/slave roles on both master and slave. Any ideas?
I think that suggests there is a difference in the HW. If the two boards performed exactly the same, there should be no difference in the measured offset. I'm not sure what that could be. Maybe the CPU is throttling due to high temperature? On x86_64 frequency scaling (power saving, turbo) is a major problem for phc2sys, causing unstable measurements and weird offsets. -- Miroslav Lichvar _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
