Re: [rtl] performance testing

[Ciro Cattuto <ciro@stud.fisica.unipg.it>]

On Thu, 25 Feb 1999, Kurt Rosenfeld wrote:

> Note 2:  It has been my observation that the density function of the 
> interrupt latency is actually multi-modal.  I first noticed this in the 
> time-domain looking at the signals on an oscilloscope.  The jitter looks 
> like multi-path interference on a TV.  There are "forbidden regions" for 
> the transitions. 

Hi, this is true also in the case of jitter affecting the scheduling
of real-time periodic tasks (not interrupt-driven). In that case,
"multi-modal" behaviour disappears when you switch to periodic mode,
and the resulting distribution function becomes a gaussian.

ciao, Ciro

--
Ciro Cattuto                                  e-mail: ciro.cattuto@pg.infn.it
                                                      ciro@stud.pg.infn.it
University of Perugia - Physics Department            ciro@pluto.linux.it
INFN - VIRGO Project                           voice: +39 075 585 3060
PLUTO Linux Users Group                          fax: +39 075 44666

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