From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bill Davidsen Subject: Re: unexpected IO-APIC, 2.4.36 SMP, AMD dual core Opteron Date: Wed, 06 Feb 2008 19:07:16 -0500 Message-ID: <47AA4BB4.1030702@tmr.com> References: Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-smp-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: "Tuynman, William (JSC-DT/USA)[USA]" Cc: linux-smp@vger.kernel.org Tuynman, William (JSC-DT/USA)[USA] wrote: > Hello, > I have been getting this "An unexpected IO-APIC was found" message. In checking, it occurs on 2.4.34 also. > > The kernel was compiled for 32 bit execution and is running on an AMD dual core Opteron. The machine is an HP Proliant, DL 585. > > I'm attaching, as text, a portion of the messages file which contains all of the boot information. > > I would be happy to assist with providing additional information that would be helpful to you. > > The first question I have is, why are you running a 2.4 kernel on a modern CPU? I suspect the SMP logic in 2.4.26 is a decade older than the hardware. SMP was pretty unusual then, multi-core was just not an end user feature. I don't doubt that the IO-APIC may have unsupported features. Might I suggest that you boot off a recent "live CD" like Fedora or Puppy Linux, just to see if you still see a problem. If not, you will have more information to evaluate your next step. -- Bill Davidsen "Woe unto the statesman who makes war without a reason that will still be valid when the war is over..." Otto von Bismark