Hello all RTLinux users and developers,
I need to schdule a procedure by a timer at every (around) 1 ms. I
set the time interval of the XtAppAddTimeOut to be 1ms. But I am
uncertain is the resolution of linux timer is such fine or not? Tijs
suggested to modify parameter HZ of
/usr/src/linux/include/asm-i386/param.h to 1024 for a 2ms timing
(attached at the end). Does it mean if modify HZ to 2048 may get a 1ms
resolution timing? If so, what should I do after this modification so
that this modification may be effective?
I am booting with RTLinux-2.0. The reason why I do this high frequency
(1000 Hz) task in linux instead of RTLinux is because this task need to
use lots of graphics, big memory (60M) for object modeling, etc which are
cubersome to do in RTLinux.
Thanks in advance.
Dingrong Yi
> > Hi!
> >
> > In RT-Linux Manifesto author writes:
> >
> > "Standard Linux takes up to 600 microseconds to start a handler and
can
> > easily be more than 20 milliseconds (20,000 microseconds) late for
a
> > periodic task."
> >
> > Is it possible to have 2 miliseconds ? I want to control very fast
robot
> > from rt-linux box.
>
> This works for x86 only:
> Try using #define HZ 1024 or some other high number in
> /usr/src/linux/include/asm-i386/param.h
>
> Usually it's 100 and that accounts for the (what I thought were 10) 20
> ms.
>
> Note that this breaks some programs like 'top' and 'ps'
>
> --
> Tijs van Bakel, <[EMAIL PROTECTED]>
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