From: Felipe Alfaro Solana <felipe_alfaro-jjFNsPSvq+iXDw4h08c5KA@public.gmane.org>
To: "Éric Brunet" <Eric.Brunet-l5PIGlIYzrxGWvitb5QawA@public.gmane.org>
Cc: acpi-devel
<acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
Subject: Re: Re: 2.6.0-pre4 hangs if acpi enabled
Date: Tue, 26 Aug 2003 17:20:15 +0200 [thread overview]
Message-ID: <1061911215.1647.2.camel@teapot.felipe-alfaro.com> (raw)
In-Reply-To: <20030826143931.GA12993-l5PIGlIYzrxGWvitb5QawA@public.gmane.org>
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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prev parent reply other threads:[~2003-08-26 15:20 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-25 11:33 2.6.0-pre4 hangs if acpi enabled Éric Brunet
[not found] ` <20030825113313.GA10691-l5PIGlIYzrxGWvitb5QawA@public.gmane.org>
2003-08-25 12:18 ` Felipe Alfaro Solana
[not found] ` <1061813912.710.18.camel-uj2ycw1wlRUpU4hxjYRcxzD7d47T8nGG@public.gmane.org>
2003-08-26 14:39 ` Éric Brunet
[not found] ` <20030826143931.GA12993-l5PIGlIYzrxGWvitb5QawA@public.gmane.org>
2003-08-26 15:20 ` Felipe Alfaro Solana [this message]
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