From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752322AbZHHVxX (ORCPT ); Sat, 8 Aug 2009 17:53:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752007AbZHHVxW (ORCPT ); Sat, 8 Aug 2009 17:53:22 -0400 Received: from smtpfb2-g21.free.fr ([212.27.42.10]:48587 "EHLO smtpfb2-g21.free.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751558AbZHHVxW (ORCPT ); Sat, 8 Aug 2009 17:53:22 -0400 Message-ID: <1249768357.4a7df3a5a62f6@imp.free.fr> Date: Sat, 08 Aug 2009 23:52:37 +0200 From: paniscus@free.fr To: linux-kernel@vger.kernel.org Subject: 2.6.26 : Strange processor / core mapping with Intel Q6600 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT User-Agent: Internet Messaging Program (IMP) 3.2.8 X-Originating-IP: 64.103.25.233 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, It seems that the cpu / core-id mapping has changed since vanilla 2.6.26 (also 2.6.26.8, 2.6.27.29) with an Intel Core 2 Quad Q6600. With 2.6.25.20 I have a correct mapping : Processor 0 <---> Core-id 0 Processor 1 <---> Core-id 1 Processor 2 <---> Core-id 2 Processor 3 <---> Core-id 3 With 2.6.26 : I have a this strange mapping : Processor 0 <---> Core-id 0 Processor 1 <---> Core-id 2 Processor 2 <---> Core-id 3 Processor 3 <---> Core-id 1 /proc/cpuinfo with 2.6.26 : processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz stepping : 11 cpu MHz : 1600.000 cache size : 4096 KB physical id : 0 siblings : 4 core id : 0 cpu cores : 4 ... ... processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz stepping : 11 cpu MHz : 1600.000 cache size : 4096 KB physical id : 0 siblings : 4 core id : 2 cpu cores : 4 ... ... processor : 2 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz stepping : 11 cpu MHz : 1600.000 cache size : 4096 KB physical id : 0 siblings : 4 core id : 3 cpu cores : 4 ... ... processor : 3 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz stepping : 11 cpu MHz : 1600.000 cache size : 4096 KB physical id : 0 siblings : 4 core id : 1 cpu cores : 4 ... ... I would appreciate it if you could help me on this. Is it maybe already an known issue ? regards, -Franck.