PCI interrupt routing with APIC broken again

[Peter Schultz]

Tomi Vainio - Sun Finland wrote:
> Hi,
> 
> My SMP system is seeing continous interrupt storm from acpi irq20.
> Originally this is a bug on my mobo but John has fixed it already
> twice tweaking the code.  I've cvsupped source 10th and 17th of April
> and it broke between these so probably PCI changes did something.  Any
> idea how to fix this now?
> 

Have you tried setting `hw.acpi.force_sci_lo=1' at the loader prompt?

Pete...

> acpi0: Overriding SCI Interrupt from IRQ 9 to IRQ 20
> 
> # vmstat -i
> interrupt                          total       rate
> irq1: atkbd0                         300          0
> irq0: clk                       23517218         99
> irq8: rtc                       30102353        127
> irq12: psm0                         3214          0
> irq14: ata0                           10          0
> irq15: ata1                           55          0
> irq16: ahc0 ahc1                  118669          0
> irq17: fxp0                        67232          0
> irq19: uhci0 bktr0              36162124        153
> irq20: acpi0                  3063111398      13024
> irq9: intpm0                       37606          0
> Total                         3153120179      13407
>