linux-kernel - Re: Why do so many machines need "noapic"?

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Date:	Sat, 15 Sep 2007 13:08:25 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Ingo Oeser <ioe-lkml@...eria.de>, Andi Kleen <andi@...stfloor.org>,
	Chuck Ebbert <cebbert@...hat.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Why do so many machines need "noapic"?

On Sat, Sep 15, 2007 at 04:08:02AM -0700, Andrew Morton wrote:

> I believe that about two years ago we broke something which caused quite a
> large number of people to need noapic.  Is that the case with any of your
> machines?  Do you know if they run 2.6.ancient without noapic?

My recollection is that we shifted from "Enable the apic even if the 
BIOS disabled it" to "Only use the apic if the BIOS didn't disable it" 
around that time, which meant that distributions could actually turn on 
apic-on-up support without breaking everything. That might correspond to 
what you're seeing.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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