Re: [Linuxptp-users] Non-zero correction field with linuxptp

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

On Mon, Sep 14, 2015 at 02:30:19PM +0530, Harini Katakam wrote:
> We are running linuxptp on both master and slave. The master and slave are
> either PCs with Ubuntu OS or a Xilinx embedded system with linux. The transit
> time is getting added in the TC i.e. it updates the 8 byte correction field.
> Does linuxptp consider this field in delay computations?

Yes.

> What config needs to be enabled for the same?

No configuration needed.  The correction fields are automatically
included in the offset calculation.  See port_synchronize() in port.c

> When we tried this by updating the correction field
> (even if only with 1 ns), we observed a hang - there was no DelayResponse frame
> observed and the sync stopped in s2 stage. If the correction field is made
> zero again (dynamically in the TC), the sync resumes as expected.

I find it hard to believe that ptp4l would hang like this.

Just what do you mean by "hang"?

Thanks,
Richard