Re: [Linuxptp-devel] Optimal P, I constants

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

On Fri, May 10, 2013 at 10:41:13AM +0200, Richard Cochran wrote:
> I spent some time this week reviewing how to obtain good PI servo
> constants, and now I am even more convinced that the choice involves
> tradeoffs that only the end user can decide.

What tradeoffs do you think the user can consider? For me, the only
things that matter are time error, frequency error and convergence
time.

> I am going to introduce a table of constants, with one PI pair per
> sync interval, but I have a few questions where I could use some
> feedback.
> 
> 1. What range of sync intervals should be supported?  2^-7 to 2^+7 ?

I have no suggestion for that.

> 2. Should user constants appear in the config file, or should we have
>    a new, separate file for that?

How about a list of EXP:P:I triplets separated by commas in the config?

Thanks,

-- 
Miroslav Lichvar