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Old 12-03-2007, 04:01 AM   #1
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Influence IRQ sharing in Linux ?


Is it possible in Linux to influence IRQ-sharing: eg. specify device A and device B should not share interrupt X ?

Recently had a problem with this under Windows... even changing PCI slots didn't resolve the problem. I may be wrong but a lack of such a feature is a pain in some situations...

Old 12-04-2007, 12:21 AM   #2
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No, you don't have any control over that, and in fact interrupts are assigned by BIOS before Linux even starts.

The PCI standard requires that devices be able to share interrupts. If you have two devices that are not working together in Windows, it is a Windows driver issue and should be taken up either with Microsoft or with the 3rd party PCI card vendor (depending).

In Linux you will generally find that drivers cooperate with interrupt sharing, and should you run across one that doesn't cooperate, at least you'll have the source code.


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