[LAU] Issue with the priority of the sound cards using rtirq

Ralf Mardorf ralf.mardorf at alice-dsl.net
Wed May 2 01:41:08 UTC 2012

> (I don't seem to find the start of the thread in my mailbox)
> ohci_hcd is there is you specify usb in the list of priorities rtirq 
> needs to raise. And nvidia is there probably because it shares an 
> interrupt with a real soundcard. Rtirq does not raise the priority of 
> only the soundcard, but everything that uses the interrupt that the 
> soundcard uses.
> AFAIK it is not possible (or simple) to raise _just_ the soundcard as
> it 
> is impossible to know which irq process corresponds to a soundcard
> (and 
> which one does not). That is because the labeling of the irq process 
> names in the ps listing is arbitrary. At least that is what I
> remember 
> seeing last I looked at this issue. You can of course manually lower
> the 
> priorities of non-soundcard irq processes with chrt.
> -- Fernando

The IRQ issue also is there for e.g. my AVLinux install, but there it
anyway is possible to get the wanted prio order:


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