From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264479AbTIDCeB (ORCPT ); Wed, 3 Sep 2003 22:34:01 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264498AbTIDCeA (ORCPT ); Wed, 3 Sep 2003 22:34:00 -0400 Received: from holomorphy.com ([66.224.33.161]:20876 "EHLO holomorphy") by vger.kernel.org with ESMTP id S264479AbTIDCd6 (ORCPT ); Wed, 3 Sep 2003 22:33:58 -0400 Date: Wed, 3 Sep 2003 19:35:01 -0700 From: William Lee Irwin III To: Steven Cole Cc: Daniel Phillips , Antonio Vargas , Larry McVoy , CaT , Anton Blanchard , linux-kernel@vger.kernel.org Subject: Re: Scaling noise Message-ID: <20030904023501.GE4306@holomorphy.com> Mail-Followup-To: William Lee Irwin III , Steven Cole , Daniel Phillips , Antonio Vargas , Larry McVoy , CaT , Anton Blanchard , linux-kernel@vger.kernel.org References: <20030903040327.GA10257@work.bitmover.com> <20030903124716.GE2359@wind.cocodriloo.com> <1062603063.1723.91.camel@spc9.esa.lanl.gov> <200309040350.31949.phillips@arcor.de> <1062641965.3483.78.camel@spc> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1062641965.3483.78.camel@spc> Organization: The Domain of Holomorphy User-Agent: Mutt/1.5.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Sep 03, 2003 at 08:19:26PM -0600, Steven Cole wrote: > I would never call the SMP locking pathetic, but it could be improved. > Looking at Figure 6 (Star-CD, 1-64 processors on Altix) and Figure 7 > (Gaussian 1-32 processors on Altix) on page 13 of "Linux Scalability for > Large NUMA Systems", available for download here: > http://archive.linuxsymposium.org/ols2003/Proceedings/ > it appears that for those applications, the curves begin to flatten > rather alarmingly. This may have little to do with locking overhead. Those numbers are 2.4.x -- wli