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SubjectRe: clock runs at double speed on x86_64 system w/ATI RS200 chipset (with APIC enabled)
I booted with 'apic=debug' in case this is useful to find out what's

dmesg of with ACPI enabled, APIC enabled, 'apic=debug':
(clock runs at double speed)

dmesg of with ACPI enabled, but disabled for PCI routing, APIC
enabled ('pci=noacpi apic=debug'):
(system hangs when loading SATA driver)

One difference I see between ACPI IRQ routing and 'pci=noacpi' is this:

(with ACPI IRQ routing)
..TIMER: vector=0x31 pin1=2 pin2=-1

(with 'pci=noacpi')
..TIMER: vector=0x31 pin1=2 pin2=0

so it would seem that mp_irqs[] differs between the ACPI case and
'pci=noacpi' for mp_ExtINT.


On Tue, 5 Apr 2005, Andi Kleen wrote:

> Alternatively you can try to boot with noapic. Does that help?
> -Andi
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