ISR and Spurious Interrupts

NTDEV
1

I have a NDIS Miniport for a PCI NIC running on win2k.
My ISR gets called repeatedly for interrupts that does
not belong to my device. I do set the flag to false
and get out. Is this a normal behaviour for all
devices?

Even though devices should have the ability to share
interrupts, why does Pnp manager allocate an IRQ that
is shared with another device in the system( even when
there are vacant IRQs.) Is their a way to ask for an
exclusive IRQ if possible.

Thanks
Daniel

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2

“Dan .” wrote in message news:xxxxx@ntdev…

[snip]

> Even though devices should have the ability to share
> interrupts, why does Pnp manager allocate an IRQ that
> is shared with another device in the system( even when
> there are vacant IRQs.) Is their a way to ask for an
> exclusive IRQ if possible.

Look through the ntdev archive for Jake Oshins’ post on how this came to be.
It’s entertaining reading.