Thomas Fruehbeck wrote:
>
> Hi Daniel,
>
> You wrote:
>
> > Peter Wurmsdobler wrote:
> > >
> > > Hi,
> > >
> > >
> > > 1. Would an ordinary linux kernel be sufficient or do I have
> > > to use rt-linux in order to guarantee that this periodic task
> > > can not be interrupted by any other interrupt?
> >
> > It depends on the sampling frecuency, but in a general purpose operating
> > systems the interrupts can be bloqued for 10's of milliseconds, so if
> > you need more than 100 Hz of Sampling freq. you need RT-Linux.
> >
>
> Where did You take the information, that plain Linux may block interrupts
> for 10's of milliseconds?
In:
http://www.zentropix.com/realtime/testdata/si.html
there is a study which shows that the interrupt response of Std-Linux
can be ut to 27.5 ms at full load.
> To me this seems queer. I can not imagine my Linux box (compile, install, X, Xvnc
>server)
> would reach it's phantastic performance, if any driver would think of blocking
> interrupts for even 1 millisec.
Sorry, but I don't understand this sentence. My english is not very good
as you can see :(
Dani.
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