[linux-audio-user] Interrupt sharing question

Mark Knecht markknecht at attbi.com
Sat Mar 1 09:50:01 EST 2003

   There shouldn't be much of a problem if you are not using USB at all.
On the good side, you're using IRQ 10, which is a high priority
interrupt, so you'll get pretty good response. 

   If you have problems, or just want to change it, then it will likely
require that you move the EMU10K1 to a different PCI slot and make
adjustments in your BIOS to organize interrupt usage a bit. It's not
difficult, but it can be trying and requires you to look at a lot of
pages in BIOS to make the choices. It's probably not worth doing it now.

   You're always better off not to share IRQs, but in your case it may
be OK.

Good luck.


On Sat, 2003-03-01 at 06:07, Larry Troxler wrote:
> Just a quick question. After installing Redhat 8, I'm a bit concerned by the 
> follwing line in my /proc/interrupts:
> 10:        476          XT-PIC  usb-uhci, usb-uhci, EMU10K1
> Aside from the extreme nausea resulting from learning that my sacred MIDI port 
> is being put in the same office as the disgusting mundane usb port,  is this 
> a performance issue if I'm not actually using the usb port?
> I suspect there is a bit of a hit because the interrupt handler now has to 
> poll all the sources, but I maybe not - I understand the principles of 
> interrupt handling but not the specifics of the PCI bus or the linux kernel.
> So do I need to do something about this, or not?
> Larry

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