Re: [Linuxptp-users] Interpretation of ptp4l results

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

On Mon, Jun 22, 2015 at 12:22:01PM +0000, Chandra Mallela wrote:
> Offset correction: the 'rms' (root mean squre - 2 ns in the above
> case) is the mean offset (calculated as squareroot of the mean of
> the offset squares) of all the offsets in the sample observed in the
> interval and 'max' (7ns) is the maximum offset observed within the
> sample.

Yes.

> Frequency correction: Mean frequency deviation observed is 156403
> ppb with the standard deviation of 7 pbb

Yes.

> (if so, is 7pbb at 3sigma?):

?

> likening it to gaussian/normal distribution

??

> Path delay: the mean value is 28ns and the standard deviation is 0:

Yes.

> likening it to the gaussian/normal distribution

???

Take a look at stats.c to see how the stddev is being calculated.
It is really straightforward.

Thanks,
Richard