hi res timer

Linux is not a hard realtime system, so you will find a jitter of _any_
size if you wait long enough and produce enough stress in the system.

If you want reliable timing you need to add something like RTAI.

-Michael

Which 2.6 kernel, there are several of them :) Is it saying "accuracy"
or is it saying "precision?"



What do you get and what is your definition of "a lot" of jitter?
What would be acceptable jitter for your situation?




I seem to recall that there can be three values for HZ now in a
2.6.mumble kernel (maybe that cam in .14?)  100, 250 and 1000 I wonder
if running HZ at 1000 and perhaps playing with timeslices and such
might get things going "well enough" without having to go all the way
to what I think is RTAI?

rick jones

I was playing with .14 recently and saw it there.  I'm not sure if it
came any earlier, though.

 > I wonder


If you don't mind that _sometimes_ the timing condition is not met, you
are fine (2.6 is said to be a better _soft_realtime_ system than
previous versions). But there is no guarantee.

-Michael