Re: Re: 2.6.0-pre4 hangs if acpi enabled

Felipe Alfaro Solana
2003-08-26T15:20:15Z

On Tue, 2003-08-26 at 16:39, Éric Brunet wrote:

> By the way, why should people use APIC and IO-APIC on UP computers ? Is
> it faster or more efficient in some way ? Kernel documentation says that
> the APIC is a ``replacement for PC-style interrupt controller''. Is there
> anything the APIC can do that the traditionnal interupt controller can't
> do ? Kernel documentation is not very incentive for wasting an extra 7.5
> ko in the kernel image...

It seems that IO-APIC removes the 15 IRQ limit that is present when
using XT-PIC-style interrupt controllers. For example, on my P4 box with
IO-APIC enabled, IRQ9 is assigned exclusively to ACPI and is not shared
between multiple hardware devices. Also, USB UHCI is mapped to IRQ 23.

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