On Mon, Jul 21, 2003 at 09:59:59AM +0100, David Brownlee wrote:
> 	Tried a -current kernel with acpi on a Dell PE1300 (with latest
> 	A12 BIOS which is supposed to support Windows server 2003). Its
> 	a dual proc box with only one proc enabled.
> 
> 	The machine is exceptionally slow, and 'systat vmstat' reports
> 	well over 30,000 interrupts/sec on 'ioapic0 pin 9'. The system
> 	at idle shows 80% interrupt CPU time. The relevant lines from
> 	systat vmstat are:

The ACPI interrupt is generating events constantly, apparently. Not sure
what would cause that. Try enabling MPVERBOSE, and send the output.
Maybe some ACPI implementations need a quirk to reverse the int
polarity.

- Frank