Re: PREEMPT_RT & threading IRQ 0

Ingo Molnar
2005-06-29T07:47:27Z

* Lee Revell <rlrevell@joe-job.com> wrote:

> Ingo, what's the status of putting irq 0 back in a thread with
> PREEMPT_RT? IIRC this had some adverse (maybe unfixable?) effects so
> it was disabled a few months ago.

the jury is still out on that one - but right now it seems it's too much
complexity for a handful of usecs of latency improvement. Especially
with things like high-resolution timer support, the threading IRQ0
doesnt seem to be worth it.

Ingo