[LinuxPPS] rt?

[Bernhard Schiffner]

On Monday 23 March 2009 18:21:56 Udo van den Heuvel wrote:
> Do we need realtime patches?
> 
> 
> http://rt.wiki.kernel.org/index.php/RT_PREEMPT_HOWTO

As usual: it depends.

If you can guarantee pps is the only interrupt: no
If you can't: perhaps
If you have an bloated, highly loaded, unpredictable desktop-system: yes

The main difference between mainline and rt is teh use of threaded interrupts.
(Quasi all the other rt-topics got merged already.)

Threaded interrupt means, that the order to of processing interrupts is given by the scheduler.
The scheduler is "easily" configurable.

Remember: rt means predictable, not fast.
(It adds an other indirection in the pps-case)

Bernhard