Re: What determines which interrupts are shared under Linux?

From: Alan Cox
Date: Tue Aug 15 2006 - 10:43:18 EST

Ar Maw, 2006-08-15 am 09:17 -0500, ysgrifennodd Roger Heflin:
> On Linux when interrupts are defined similar to below, what defines say
> ide2, ide3 to be on the same interrupt? The bios, linux, the driver using
> the interrupt? And can that be controlled/overrode at the
> kernel/driver level?

Only with a soldering iron. They are the way the system is wired. Moving
boards between slots may change the IRQ allocation.

> I have identified that the disks that are shared on ide2, ide3 do funny
> things when both are being heavily used (dma_expiry), this is an older
> driver versions

That could be occuring just through lack of PCI bus bandwidth.

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