Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S937035AbXHOXRm (ORCPT ); Wed, 15 Aug 2007 19:17:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S933974AbXHOXRY (ORCPT ); Wed, 15 Aug 2007 19:17:24 -0400 Received: from zrtps0kp.nortel.com ([47.140.192.56]:56466 "EHLO zrtps0kp.nortel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932738AbXHOXRW (ORCPT ); Wed, 15 Aug 2007 19:17:22 -0400 Message-ID: <46C3897A.6060106@nortel.com> Date: Wed, 15 Aug 2007 17:17:14 -0600 From: "Chris Friesen" User-Agent: Mozilla Thunderbird 1.0.2-6 (X11/20050513) X-Accept-Language: en-us, en MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: dual Xeon hyperthread system only showing up as 2 cpus Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 15 Aug 2007 23:17:18.0441 (UTC) FILETIME=[6CA65D90:01C7DF92] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1921 Lines: 79 Hi all, I've got a system that has two hyperthread-capable Xeons. If I boot it with 2.6.10 it shows up as 4 cpus, but with 2.6.14 it only shows 2 cpus. The relevent boot logs are: 2.6.10: DMI 2.3 present. ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled) Processor #0 15:2 APIC version 20 ACPI: LAPIC (acpi_id[0x02] lapic_id[0x06] enabled) Processor #6 15:2 APIC version 20 ACPI: LAPIC (acpi_id[0x03] lapic_id[0x01] enabled) Processor #1 15:2 APIC version 20 ACPI: LAPIC (acpi_id[0x04] lapic_id[0x07] enabled) Processor #7 15:2 APIC version 20 Using ACPI for processor (LAPIC) configuration information Intel MultiProcessor Specification v1.4 Virtual Wire compatibility mode. Processors: 4 2.6.14: DMI 2.3 present. Intel MultiProcessor Specification v1.4 Virtual Wire compatibility mode. OEM ID: INTEL Product ID: KingsCanyonC APIC at: 0xFEE00000 Processor #0 15:2 APIC version 20 Processor #6 15:2 APIC version 20 Processors: 2 The 2.6.14 config file includes: CONFIG_MPENTIUM4=y CONFIG_X86_CMPXCHG=y CONFIG_X86_XADD=y CONFIG_X86_L1_CACHE_SHIFT=7 CONFIG_RWSEM_XCHGADD_ALGORITHM=y CONFIG_GENERIC_CALIBRATE_DELAY=y CONFIG_X86_WP_WORKS_OK=y CONFIG_X86_INVLPG=y CONFIG_X86_BSWAP=y CONFIG_X86_POPAD_OK=y CONFIG_X86_GOOD_APIC=y CONFIG_X86_INTEL_USERCOPY=y CONFIG_X86_USE_PPRO_CHECKSUM=y # CONFIG_HPET_TIMER is not set CONFIG_SMP=y CONFIG_NR_CPUS=4 # CONFIG_SCHED_SMT is not set CONFIG_PREEMPT_NONE=y CONFIG_PREEMPT_BKL=y CONFIG_X86_LOCAL_APIC=y CONFIG_X86_IO_APIC=y CONFIG_X86_TSC=y CONFIG_X86_MCE=y CONFIG_X86_MCE_NONFATAL=y CONFIG_X86_MCE_P4THERMAL=y CONFIG_MICROCODE=y CONFIG_X86_MSR=y CONFIG_X86_CPUID=y Anyone have any ideas? Chris - 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/