Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753467Ab0FYAYF (ORCPT ); Thu, 24 Jun 2010 20:24:05 -0400 Received: from mail-iw0-f174.google.com ([209.85.214.174]:42863 "EHLO mail-iw0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751405Ab0FYAYC (ORCPT ); Thu, 24 Jun 2010 20:24:02 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:content-type:content-transfer-encoding; b=Y/rarN4lTZV8vf/DTpZgEPdRAGuSPFriHFLV1v+TgLXS5ASPMJIxtedeCmd8+vLwko jz/FkSLuHUuQoQKyEq0nyIfw+kCAcQJf3MSVR1O6H8nuXNKm9KGRWBE1/kWe9G0oH0Rd Q11WMecVPhK3l0/JXUH4wm8+iSpo4la0wXv04= Message-ID: <4C23F71F.7000806@gmail.com> Date: Thu, 24 Jun 2010 18:23:59 -0600 From: Robert Hancock User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.10) Gecko/20100621 Fedora/3.0.5-1.fc13 Thunderbird/3.0.5 MIME-Version: 1.0 To: Roland Dreier CC: Kurt Newman , linux-kernel@vger.kernel.org Subject: Re: 2.6.32.1 kernel unable to use more than 2 of 16 CPUs on Intel E5540 (i7) References: <4C23D1E9.9050007@globaldataguard.com> 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: 892 Lines: 19 On 06/24/2010 04:05 PM, Roland Dreier wrote: > Your config seems to have CONFIG_PM and therefore CONFIG_ACPI disabled. > So the kernel is relying on mptable information. Unsurprisingly on a > modern system, that info is probably broken -- since everything would > have been tested with ACPI. > > Try turning on CONFIG_ACPI and see if that helps at all. Indeed, not having ACPI enabled will prevent any multi-core CPU detection. ACPI really has to be enabled for any modern x86 system to work properly. I'd think that the CONFIG_ACPI really should be defaulted on more strongly - maybe force it on if CONFIG_EMBEDDED isn't set or something.. -- 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/