On Wed, 3 Jul 2002, Xinwen - Fu wrote:
> Hi, all,
> I'm curious that if a network card interrupt happens at the same
> time as the kernel timer expires, what will happen?
>
> It's said the kernel timer is guaranteed accurate. But if
> interrupts are not masked off, the network interrupt also should get
> response when a kernel timer expires. So I don't know who will preempt
> who.
>
> Thanks for information!
>
> Xinwen Fu
The highest priority interrupt will get serviced first. It's the timer.
Interrupts are serviced in priority-order. Hardware "remembers" which
ones are pending so none are lost if some driver doesn't do something
stupid.
Cheers,
Dick Johnson
Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips).
Windows-2000/Professional isn't.
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