[Click] About the Counter element

[Eddie Kohler]

Hi Roberto,

Actually, the smoothing factor for that RateEWMA is 1/16, as extrapolated from 
the stability_shift of 4 (the first template parameter).

None of this was easy to figure out before, since none of it was documented. 
But it is now.

http://www.read.cs.ucla.edu/click/doxygen/classDirectEWMAX.html
http://www.read.cs.ucla.edu/click/doxygen/classFixedEWMAXParameters.html
http://www.read.cs.ucla.edu/click/doxygen/classStabilityEWMAXParameters.html

http://www.read.cs.ucla.edu/click/doxygen/classRateEWMAX.html
http://www.read.cs.ucla.edu/click/doxygen/structRateEWMAXParameters.html

Note that this documentation applies ONLY to the current version of Click.

Eddie


Roberto Riggio wrote:
> Hi,
> 
> from the click documentation i read that the counter element:
> 
> "Returns the recent arrival rate, measured by exponential 
> weighted moving average, in packets per second."
> 
> However i do not understand how to set the smoothing factor. 
> I gave a look at ewma.hh and i saw that you ewma class used in
> counter uses 1 as value for N so also the smoothing factor 
> would be 1 in this case. 
> 
> So as far as I've understood i should use the EWMAX class in
> order to implement my own exponential average. Do you have
> any documentation about this class?
> 
> Thanks
>