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From: Tomi Vainio - Sun Finland <Tomi.Vainio@Sun.COM>
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Date: Tue, 20 Apr 2004 15:23:50 +0300
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X-Mailer: VM 7.18 under 21.4 (patch 9) "Informed Management" XEmacs Lucid
Subject: PCI interrupt routing with APIC broken again
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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?

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

  Tomppa