[LinuxPPS] rt?

[Cirilo Bernardo]

On 3/23/09, Bernhard Schiffner <bernhard at schiffner-limbach.de> wrote:
> 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
>
>

LinusPPS has to run regardless of the presence of any additional
patches, otherwise it will never be accepted in the main line.  I
can't imagine any need for RT unless you are having serious problems
with jitter due to latency.

- Cirilo