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

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

On Sun, May 05, 2013 at 03:14:21PM +0200, Richard Cochran wrote:
> On Fri, May 03, 2013 at 06:17:41PM +0200, Miroslav Lichvar wrote:
> > 
> > What do you think?
> 
> At first glance, some of the constants seem promising, especially the
> a=10 column.

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.

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 ?

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

Thanks,
Richard