From mboxrd@z Thu Jan 1 00:00:00 1970 From: Felipe Alfaro Solana Subject: Re: Re: 2.6.0-pre4 hangs if acpi enabled Date: Tue, 26 Aug 2003 17:20:15 +0200 Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <1061911215.1647.2.camel@teapot.felipe-alfaro.com> References: <20030825113313.GA10691@lps.ens.fr> <1061813912.710.18.camel@teapot.felipe-alfaro.com> <20030826143931.GA12993@lps.ens.fr> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <20030826143931.GA12993-l5PIGlIYzrxGWvitb5QawA@public.gmane.org> Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: To: =?ISO-8859-1?Q?=C9ric?= Brunet Cc: acpi-devel List-Id: linux-acpi@vger.kernel.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. ------------------------------------------------------- This SF.net email is sponsored by: VM Ware With VMware you can run multiple operating systems on a single machine. WITHOUT REBOOTING! Mix Linux / Windows / Novell virtual machines at the same time. Free trial click here:http://www.vmware.com/wl/offer/358/0