Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756198AbYHMReI (ORCPT ); Wed, 13 Aug 2008 13:34:08 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752338AbYHMRd4 (ORCPT ); Wed, 13 Aug 2008 13:33:56 -0400 Received: from yw-out-2324.google.com ([74.125.46.31]:33576 "EHLO yw-out-2324.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751583AbYHMRdz (ORCPT ); Wed, 13 Aug 2008 13:33:55 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=opbJg6QJg03c4I5OI58Qt3vjjuuPcJQJuD9w47B40K0I4HkfVPqqgWgUhG/W2N2/HB 9iISJmHV6kQ2WZ2uaP6pZIY7Y0TseIA4mnpRaZqZSHbEOiM5cHQ1Pm+6Ir7MkfdXyZoh fusikzkax9n9Agp7zeJPAi6T3MeGES0tsKSTE= Message-ID: Date: Thu, 14 Aug 2008 01:33:53 +0800 From: "Jeff Chua" To: "Ingo Molnar" Subject: Re: 2.6.27rc1 cannot boot more than 8CPUs Cc: "Yinghai Lu" , "David Miller" , "Linux Kernel" In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <20080813141629.GD19397@elte.hu> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1317 Lines: 36 On Thu, Aug 14, 2008 at 1:10 AM, Jeff Chua wrote: > On Wed, Aug 13, 2008 at 10:16 PM, Ingo Molnar wrote: > >> btw., could you please check that v2.6.27-rc3 (or later) kernels boot >> fine (with about 8 cpus) even if you have genericarch/bigsmp disabled, >> and do not silently hang as it happened on your box before? > > With 16 CPUs, it still hangs, but now the console is showing the > errors as intended. > ... but it is supposed to hang? I tried with just CONFIG_NR_CPUS=8 and this time it booted, but stange thing is I only see 2 CPUs! To be more precise, it's without both CONFIG_X86_GENERICARCH and CONFIG_X86_BIGSMP. And when I tried to enable the CPUs, it complained about: # cat cpu6/online 0 # echo 1 > cpu6/online More than 8 CPUs detected - skipping them. Use CONFIG_X86_GENERICARCH and CONFIG_X86_BIGSMP. -bash: echo: write error: Input/output error Prior to the patch, the system booted with all 8 CPUs. Again, if I enable both CONFIG_X86_GENERICARCH and CONFIG_X86_BIGSMP, I get all 16 CPUs. Thanks, Jeff. -- 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/