From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Morton Subject: Re: only a single core (out of 8) initialized Date: Thu, 4 Jun 2009 20:29:33 -0700 Message-ID: <20090604202933.d7c24c3d.akpm@linux-foundation.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: Received: from smtp1.linux-foundation.org ([140.211.169.13]:50244 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752281AbZFEDbh (ORCPT ); Thu, 4 Jun 2009 23:31:37 -0400 In-Reply-To: Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: david@lang.hm Cc: linux-kernel , linux-acpi@vger.kernel.org, Ingo Molnar , Thomas Gleixner , "H. Peter Anvin" On Thu, 4 Jun 2009 19:52:36 -0700 (PDT) david@lang.hm wrote: > this is 2.6.30-rc7 Were any earlier kernels OK? > with a patch added to debug a nv sata driver > incompatibility with the Intel SSDs on a tyan motherboard > > on one system it sees all 8 cores, on the other system it only initializes > one core. > > can anyone help me spot what's going wrong in the one that's only seeing a > single core? If I'm reading things correctly it's seeing both sockets for > the NUMA setup, but then only initializing one core on the first socket. good: SMP: Allowing 8 CPUs, 4 hotplug CPUs bad: SMP: Allowing 1 CPUs, 0 hotplug CPUs perhaps due to ACPI: No APIC-table, disabling MPS You could have a poke around in arch/x86/kernel/smpboot.c() and find out what happened here. I'd be suspecting this code triggered: /* no processor from mptable or madt */ if (!num_processors) num_processors = 1; because ACPI doesn't like that board. Did you look into updating the BIOS?