[LAU] Isolating/dedicating Interrupts (was: irqbalance)?

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? So that the other ones shall use a different one (and keep sharing, if the are happy there)? Links are welcome, too, of course. So far I just found info on setting interrupt CPU affinity, but not about configuring an exclusive interrupt for a given PCI device.