* Gene Heskett <[email protected]> wrote:
> Glitch reports as they develop of course.
>
> Q: Whats the diff between turning on hardirq's in mode 3, and mode 4?
well, "mode 3" is PREEMPT_DESKTOP - normal CONFIG_PREEMPT on the
mainstream kernel. If you turn on hardirq/softirq threading then you can
e.g. chprio your sound IRQ to have better audio latencies. It will cause
runtime overhead though. On "mode 4" (PREEMPT_RT) hardirq/softirq
threading is mandatory (due to the processing model).
Ingo
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