Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757967AbYHFDbv (ORCPT ); Tue, 5 Aug 2008 23:31:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752190AbYHFDbY (ORCPT ); Tue, 5 Aug 2008 23:31:24 -0400 Received: from wolverine02.qualcomm.com ([199.106.114.251]:16283 "EHLO wolverine02.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752668AbYHFDbW (ORCPT ); Tue, 5 Aug 2008 23:31:22 -0400 X-IronPort-AV: E=McAfee;i="5200,2160,5354"; a="5180317" Message-ID: <48991B07.3050500@qualcomm.com> Date: Tue, 05 Aug 2008 20:31:19 -0700 From: Max Krasnyansky User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: Jeff Chua CC: lkml Subject: Re: 2.6.27rc1 cannot boot more than 8CPUs References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 773 Lines: 21 Jeff Chua wrote: > I've a Dell R900 with 4 quad-core Xeon processors (total 16CPUs), but > can only managed to boot up with CONFIG_NR_CPUS=8. Setting > CONFIG_NR_CPUS=16 causes the kernel to hang while booting. You could try booting CONFIG_NR_CPUS=16 with maxcpus=8 (kernel command line option). If it boots you can then try bringing the rest of the cpus online manually echo 1 > /sys/devices/system/cpu/cpu8/online ... echo 1 > /sys/devices/system/cpu/cpu15/online Might get a better OOPS/BUG_ON/etc report. Max -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/