From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265251AbUBJU3d (ORCPT ); Tue, 10 Feb 2004 15:29:33 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265620AbUBJU3d (ORCPT ); Tue, 10 Feb 2004 15:29:33 -0500 Received: from prgy-npn1.prodigy.com ([207.115.54.37]:11025 "EHLO oddball.prodigy.com") by vger.kernel.org with ESMTP id S265251AbUBJU3c (ORCPT ); Tue, 10 Feb 2004 15:29:32 -0500 Message-ID: <40294013.7000202@tmr.com> Date: Tue, 10 Feb 2004 15:33:23 -0500 From: Bill Davidsen User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6b) Gecko/20031208 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Hod McWuff CC: Linux Kernel Mailing List Subject: Re: HT CPU handling - 2.6.2 References: <1nqw6-5W0-25@gated-at.bofh.it> In-Reply-To: <1nqw6-5W0-25@gated-at.bofh.it> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hod McWuff wrote: > I've got a 2.0A GHz P4, advertised as non-hyperthread, that seems to be > reporting the presence of a second CPU. It also seems to be disabled by > setting bit 7 of its ID. I've tried compiling with support for 130 CPU's > and nothing changed. What would have to be done to get this disabled > CPU half back online? > > Feb 9 04:45:03 pug ACPI: Local APIC address 0xfee00000 > Feb 9 04:45:03 pug ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled) > Feb 9 04:45:03 pug Processor #0 15:2 APIC version 20 > Feb 9 04:45:03 pug ACPI: LAPIC (acpi_id[0x02] lapic_id[0x81] disabled) > Feb 9 04:45:03 pug Processor #129 invalid (max 16) > Feb 9 04:45:03 pug ACPI: LAPIC_NMI (acpi_id[0x01] dfl dfl lint[0x1]) > Feb 9 04:45:03 pug ACPI: LAPIC_NMI (acpi_id[0x02] dfl dfl lint[0x1]) Look in /proc/cpuinfo for number of siblings. If it's one you have no HT capability, the stuff for HT is mostly there but there's no sib to share. Sort of like a Siamese twin who's an only child or some such. You have a funky APIC and not much else. Don't know if the LAPIC is actually useful. -- Bill Davidsen, TMR