Re: [Linuxptp-users] Interpretation of ptp4l results

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

On Sun, Jun 21, 2015 at 11:09:08PM +0000, Chandra Mallela wrote:

> However, you mention that 'max' for the offset is simply the maximum
> offset observed in the sample. In that case, do frequency correction
> and offset correction values differ in their definitions (with 7ns
> in the offset defining the max offset in the sample whereas 7 pbb in
> the frequency showing the maximum deviation from the mean)?

These are two different parameters, and they are indeed defined
differently.  The offset is the observed offset based on the result of
the PTP.  The frequency is the output from the servo, and it is only
indirectly related to the observed offset.  For example, using a weak
proportional weight, you will have see a smaller range of frequencies.
Or if you prohibit resetting the clock, a large offset will cause a
constant frequency value (steering using the maximum possible value).

HTH,
Richard