Re: [Linuxptp-devel] [PATCH RFC 0/6] Improve accuracy with software timestamping

[Miroslav L. <mli...@re...>]

On Mon, Mar 09, 2015 at 08:36:43PM +0100, Richard Cochran wrote:
> The really interesting comparision would be the actual offset after
> PI servo control.  I am looking to compare the result of your patch
> set on a small but real network...

Ok.

To give you an idea what difference you can expect with raw
delay/offset and weights, here are graphs from a simulation with
10us jitter and default PI constants with SW timestamping.

https://mlichvar.fedorapeople.org/tmp/ptp/ptp4l_error.png

The RMS time error improved from 2.71 us to 1.85 us and 1.46 us. The
RMS frequency error improved from 1.08 ppm to 0.73 ppm and 0.53 ppm.

-- 
Miroslav Lichvar