From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Vladimir G. Ivanovic" Subject: Re: Why is "noapic" with some Dual P3 boards necessary? Date: Tue, 29 Oct 2002 09:03:23 -0800 Sender: linux-smp-owner@vger.kernel.org Message-ID: <200210291703.g9TH3Np26310@bach.leonora.org> References: <200210271208.04738.kleine_matthias@gmx.de> Return-path: In-Reply-To: Your message of "Sun, 27 Oct 2002 13:08:04 +0200." <200210271208.04738.kleine_matthias@gmx.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-smp@vger.kernel.org Cc: Matthias Kleine It is not necessary to boot a CUV4X-DLS board with the "noapic" option. I have been running a CUV4X-DLS board (== CUV4X-D + LAN + SCSI) for over a year now with APIC. You must however fall back to MPS 1.1 from the default MPS 1.4. (It's a BIOS setting.) I suspect that a CUV4X-D board will have the same behavior. --- Vladimir ------------------------------------------------------------------------ Vladimir G. Ivanovic http://leonora.org/~vladimir 2770 Cowper St. vladimir@acm.org Palo Alto, CA 94306-2447 +1 650 678 8014 "MK" == Matthias Kleine writes: MK> I am using an ASUS CUV4X-D mainboard since the days this MK> board came out (about beginning of 2001). Right from the MK> beginning, it was necessary to start the kernel with the "noapic" MK> option. This is, of course, a limitation of an SMP system, because MK> there are not all the IRQ's of both CPU's available when booted MK> "noapic". So I guess it must have some strong technical reason MK> why this kind of board cannot be used in apic mode. Can anybody MK> explain me the very reason why this is the case?