Free Ekanayaka wrote:
> Hi Micheal,
>
> |--==> Michael Jarosch writes:
>
> MJ> Hello, again!
> MJ> 2) I've got 7 IRQs working with realtime! Wouldn't it be useful,
> MJ> reducing it only to some of them I really need?
>
> MJ> While booting, it goes like this:
>
> MJ> rtirq: start [rtc] irq=8 pid=248 prio=90: OK.
> MJ> rtirq: start [snd] irq=11 pid=2136 prio=85: OK.
> MJ> rtirq: start [snd] irq=22 pid=2124 prio=84: OK.
> MJ> rtirq: start [snd] irq=18 pid=734 prio=83: OK.
> MJ> rtirq: start [uhci_hcd] irq=21 pid=730 prio=80: OK.
> MJ> rtirq: start [i8042] irq=1 pid=275 prio=75: OK.
> MJ> rtirq: start [i8042] irq=12 pid=274 prio=74: OK.
>
> MJ> O.k., I'll need the realtime-clock. But two of the three sound-devices
> MJ> aren't needed for realtime-priority. Again, I don't use any USB-Audio
> MJ> device ("uhci-hcd"). By the way: what is that "i8042" for? Do I need it?
>
> MJ> And last not least: How do I configure rtirq for switching on/off
> MJ> certain IRQs for realtime-priority?
>
> As far as I know rtirq has not such fine tune features, you will have
> to write you script, or tweak rtirq to support blacklists, man chrt
> will be your friend :)
>
> Ciao,
>
> FreeHi :) I'm not familiar with Linux, but naive as I'm, I guess it doesn't matter if there are two unneeded devices having an interrupt. When the interrupt is requested a rout check some IO registers, if they will send something, and because they won't and nothing will be send that the devices has to receive, the rout returns. That might be some cycles, that won't have any impact on the performance. Am I wrong? Cheers, Ralf
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