[LAU] Isolating/dedicating Interrupts

[Jeremy Jongepier]

On 11/21/2015 02:40 PM, Ede Wolf wrote:
> Following the discussion about irq_balance, I was having a look at my
> interrupts, I figured that my most important devices all share a single
> one:
> 
> 
> cat /proc/interrupts:
> 
>  20:  <CPU List> IR-IO-APIC   20-fasteoi   ohci_hcd:usb9, snd_rme9652,
> vfio-intx(0000:07:00.0)
> 
> So some USB, my passed-through parallel card and my soundcard are all
> sharing interrupt #20.
> 
> Now I wonder, is there a way to force the system to use a dedicated
> interrupt just for the soundcard?

No, unless the system supports MSI (Message Signaled Interrupts) and the
sound card could use that. It's been a while since I had to use that so
I have no links at hand :(
You could also use rtirq for this and make sure the IRQ thread for
snd_rme9652 gets the highest prio:
http://wiki.linuxaudio.org/wiki/system_configuration#rtirq
Another option would be to stick the RME in a different PCI(e) slot if
possible.

Jeremy

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