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SubjectRe: Not counting "serial" interrupts
On Mon, 1 Apr 1996, Theodore Ts'o wrote:

> Can anyone explain why I have 2 systems, both with 2 serial ports which I
> use, yet I get the following:
>
> crucible:~$ cat /proc/interrupts
> 0: 31742599 timer
> 1: 75862 keyboard
> 2: 0 cascade
> 5: 710241 3c509
> 12: 174002 PS/2 Mouse
> 13: 1 math error
> 14: 565977 + ide0
>
> Where are IRQ 3 and 4 ?????
>
> The serial drivers unregister the IRQ when they're done using it, and
> register the IRQ when they need it. Hence, they only show up in
> /proc/interrupts when the com ports are in use.
>

Many thanks to everyone who cleared this up for me... Boy do I feel silly.

Steve



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