My take on IRQ sharing is: unless you have seperate channels (as with IDE,
etc), everything bound to the interrupt will be interrupted at the same
time... which will cause problems in many cases.. I had 2 things on the
same IRQ one time on accident.. one of them was my sound card.. the sound
would work fine.. but it would sorta loop every couple seconds.. so I knew
it was on the same interrupt as something else.. and prolly with something
that was calling the interrupt for probing reasons or whatever.. I think
it ended up being the USB host or parallel port or something.
Only one thing can be interrupted at a time.. I hate IRQ sharing.. the x86
is so restrictive.. you have like IRQ's 3 and 4 for serial ports, 5 is
open but usually used for audio, 7 is open but usually used for parallel
port, 9 I was once told was linked with 2 and is the funky IRQ, 10 is
usually free but now adays is used for the USB host (or NIC in my case),
11 is available unless you have yer AGP on it like I do. Which is it.. 10
or 11 is that weird IRQ with the 8/16bit thing. In any event.. I don't
have a USB host due to limitations. I've plum run out of IRQs and I don't
have all that much stuff in this thing.
Anyone know of a good SPARC retailer? :)
On Fri, 19 Jan 2001, Mikkel L. Ellertson wrote:
> On Fri, 19 Jan 2001, Vineeta wrote:
>
> >
> > yes,interrupt has to be different for 2 ethernet cards.
> >
> > Vineeta
> >
> I thought PCI NICs could share an interupt. I know ISA cards usualy can
> not share interupts. Also the parrelle port code has problems with two
> ports sharing an interupt. I have a PCI card with two ports on one
> interupt that doesn't work well with Linux yet...
>
>
>
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--
-Statux
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