Re: [Linuxptp-users] Interpretation of ptp4l results

[Chandra M. <sma...@al...>]

Hi Richard,

Thank you very much. Yes, I need to look at stats.c block - trying to take advantage of your having gone through it already. I am sorry for that.

Thanking you in anticipation,
Regards,
Chandra

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"Knowledge speaks, Wisdom listens"



-----Original Message-----
From: Richard Cochran [mailto:ric...@gm...]
Sent: Monday, June 22, 2015 9:13 PM
To: Chandra Mallela
Cc: Miroslav Lichvar; lin...@li...
Subject: Re: [Linuxptp-users] Interpretation of ptp4l results

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

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