Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932986AbWL0PvH (ORCPT ); Wed, 27 Dec 2006 10:51:07 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932987AbWL0PvH (ORCPT ); Wed, 27 Dec 2006 10:51:07 -0500 Received: from web32607.mail.mud.yahoo.com ([68.142.207.234]:42029 "HELO web32607.mail.mud.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S932986AbWL0PvG (ORCPT ); Wed, 27 Dec 2006 10:51:06 -0500 Message-ID: <20061227155104.91856.qmail@web32607.mail.mud.yahoo.com> X-YMail-OSG: J0nhGcgVM1nmoth4LO_KZTmxanY2vqQpfwD8_bhFZGxystcrDTuKrsFU_gOpQcviTwZOpRZJIdAN2bAWcE_CKqcrZJujula5vyLe5lof8o9AxxirwdK. X-RocketYMMF: knobi.rm Date: Wed, 27 Dec 2006 07:51:04 -0800 (PST) From: Martin Knoblauch Reply-To: knobi@knobisoft.de Subject: Re: How to detect multi-core and/or HT-enabled CPUs in 2.4.x and 2.6.x kernels To: Gleb Natapov , Arjan van de Ven Cc: linux-kernel@vger.kernel.org In-Reply-To: <20061227152240.GC10953@minantech.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 754 Lines: 25 --- Gleb Natapov wrote: > > > If I run two threads that are doing only calculations and very little > or no > IO at all on the same socket will modern HT and dual core be the same > (or close) performance wise? > actually I wanted to write that "HT as implemented on XEONs did not help a lot for HPC workloads in the past".... Cheers Martin ------------------------------------------------------ Martin Knoblauch email: k n o b i AT knobisoft DOT de www: http://www.knobisoft.de - 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/