On Tue, 23 Feb 1999, Peter Woit wrote:
>
> I seem to have figured this out. It seems that my ethernet card was
> in PCI slot 5, moving the video card to slot 5, scsi to slot 1 and
> ethernet to slot 2 seems to have fixed this.
>
> I don't know if the IO-APIC code is supposed to handle this situation.
> If not, maybe there should be a FAQ entry "expect cards in slot 5 to
> have IRQ problems with SMP".
>
That is _wrong_. It should say "PCI IRQ assignment is based on witchcraft
and superstition, with a little luck thrown in to boot. In my ALR quad
P6, I had an intel etherexpress pro 100, and a buslogic bt958. And no
matter what I did, they always shared an IRQ, often with a serial port.
Then one day, a particular sunspot configuration happened, and the two
cards moved to different IRQ's never to share again (knock on wood.)
However, in the 2.1/2.2 kernels, sharing isn't a problem. But it really
is mysterious how this works. It's on my list of things to investigate
one day. But my quad xeon behaves differently, which probably means this
is not worth worrying about. :)
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