Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755391AbYCVKEo (ORCPT ); Sat, 22 Mar 2008 06:04:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753653AbYCVKEh (ORCPT ); Sat, 22 Mar 2008 06:04:37 -0400 Received: from smtp-out03.alice-dsl.net ([88.44.63.5]:48689 "EHLO smtp-out03.alice-dsl.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753639AbYCVKEg (ORCPT ); Sat, 22 Mar 2008 06:04:36 -0400 To: Allan Menezes Cc: linux-kernel@vger.kernel.org Subject: Re: HPL benchmarking linux kernel for shared memory performance. References: <47E48575.7040009@sympatico.ca> From: Andi Kleen Date: 22 Mar 2008 11:04:32 +0100 In-Reply-To: <47E48575.7040009@sympatico.ca> Message-ID: <87ve3fgjm7.fsf@basil.nowhere.org> User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-OriginalArrivalTime: 22 Mar 2008 09:57:56.0655 (UTC) FILETIME=[34139BF0:01C88C03] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 758 Lines: 13 Allan Menezes writes: > from filling the register EAX with values above 0x03 > So I was seeing only 2 cores for a quad core in cat /proc/cpuinfo on > all nodes giving me lousy performance for every kernel except some > like 2.6.23.13 and 2.6.23.14. You say some older kernels behaved better than newer ones in the two core oversub configuration? That would be still an issue that should be investigated. After all Linux should run well even with oversubscribing on two cores. -Andi -- 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/