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A realtime kernel (a kernel with the RT patchset and CONFIG_PREEMPT_RT option enabled) comes with a tasklet API: http://subversion.ffado.org/wiki/IrqPriorities

That's what rtirq controls, those bottom halves of irq handlers, also called tasklets. So if you don't have a realtime kernel rtirq does close to nothing.
And I'm running realtime kernels with closed source nvidia drivers too, never experienced any real issues.

Best,

Jeremy