On Wed, Nov 6, 2019 at 11:13 AM jawad ahmed saleemi <jawad.sale...@hotmail.com> wrote: > > Hi, > > In our setup, when the grandmaster reboots, the ptp slave gets out of sync > and is unable to resync again. The ptp slave shows a huge offset once the > grandmaster comes back up and it remains like this. When I set the > step_threshold parameter to 0.00002, the offset reduces but the port state > stays in UNCALIBRATED state and is unable to switch to RS_SLAVE state. On > further increasing the step_threshold parameter to 0.02, the ptp slave is > able to resync with the master and switch to RS_SLAVE state easily. I am > confused about what is going on here. Why didn't 0.00002 worked but 0.02 did. > > Another thing I am a bit confused about is first_step_threshold. > > In the manpage it says, > > The maximum offset the servo will correct by changing the clock frequency > instead of stepping the clock. This is only applied on the first update. > > I would like to know what does "first update" mean in this context.
As I read the documentation, when the ptp slave starts there is a first update, then a second update etc etc. If the grandmaster was rebooted or changed, then there might be a first update from that instance of a Grandmaster, it would not be the _first_ update of the ptp slave. Cheers Arne _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
