Hello, > Software timestamping is much less accurate and legacy timestamping is not supported in the mainline driver AFAIK. The UTC offset can be specified in the configuration, if for some reason 37 doesn't work for you.
How do you specify the UTC offset? (I’m afraid 37 will change to 38, etc) > Yeah, that won't work very well. You need HW timestamping and a very slow servo. Ok, so -H and no linreg > Why do you need PTP? If there are no switches, you could use NTP with HW timestamping and get a similar performance, except the configuration would be much simpler (no need for mixing PTP with NTP). I’m not sure I need it. I just want all the servers clocks to be as accurate as possible, as explained above for the tmeseries consistency. After some brief reading, I concluded NTP would never give me more precision than a few ms – even worse ethan what I achieve now with usec level > I don't think L2 will help, at least not with e1000e. The connection between server 2 and 3 could be useful if server 1 will not always be the grandmaster. But this would complicate the configuration quite a bit (it's not possible with timemaster). I can kick out timemaster. At this point I may as well write all my configs manually. There are 3 servers because sometimes one needs to be rebooted or maintained, while the measurements go on. I was also hoping this sidelink between server2 and 3 could create another parameter in the regression to better take into account server1 RTC clock natural drift one way or the other. > I think you need one of them to be synchronized to the system clock (using very small PI constants) as I suggested before. The other interface needs to be synchronized to the first interface using default PI constants or linreg. ptp4l needs to be configured with the boundary_clock_jbod option. So do you mean, on server1 for both on eth2 (server1 to server 2) and eth3 (server 1 to server 3) /usr/sbin/phc2sys -s CLOCK_REALTIME -c %i -r -r -P 1e-4 -I 1e-8 -O37 On server 3 and server 2 direct link to server1: /usr/sbin/phc2sys -s eth1 -c %i -r -r E lingreg On server 3 and server 2 direct link to eachother: /usr/sbin/phc2sys -s CLOCK_REALTIME -c %i -r -r-P 1e-4 -I 1e-8 --boundary_clock_jbod 1 Any suggestion is welcome!
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