From: Frank van der Linden <fvdl@netbsd.org>
Subject: Re: acpi: 30k+/sec interrupts on ioapic0 pin 9
Date: Tue, 22 Jul 2003 00:39:24 +0200

> 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.

The polarity is one of possibilities, but I'm not sure, either.
There's a similar problem reported on Linux 2.5 development tree,
and it's still unresolved.

http://bugme.osdl.org/show_bug.cgi?id=774
(This may require login account)

---
Takayoshi Kochi