Re: [Linuxptp-users] Bug in LinuxPTP

[Richard C. <ric...@gm...>]

On Wed, Jul 03, 2013 at 05:46:04PM +0530, Aman Sharma wrote:
> 
> When we start the PTP on both machine, for first time slave time syncs to
> Master time.
> But during runtime if we are changing time(manually changing System time)
> of Master or Slave both are not syncing to each other.

The master will not synchronize to the slave!

Also, it does not make sense to change the time on the slave. That is
the job of the ptp4l program.

> We have to restart the PTP(i.e have to run command again) to make them sync
> to each other.
> 
> Please let us know the command or process, so that Master and Slave can
> sync there time during run time

As Jacob wrote, there is an option for jumping the clock.
>From the man page:

  pi_offset_const
         The maximum offset the PI controller will  correct  by  changing
         the  clock  frequency instead of stepping the clock. When set to
         0.0, the controller will never step the clock except  on  start.
         The default is 0.0.

If you set this to, say 1.0, then the slave will jump the clock
whenever the offset exceeds one second.

HTH,
Richard