From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265575AbTIDV3o (ORCPT ); Thu, 4 Sep 2003 17:29:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265584AbTIDV3o (ORCPT ); Thu, 4 Sep 2003 17:29:44 -0400 Received: from holomorphy.com ([66.224.33.161]:64145 "EHLO holomorphy") by vger.kernel.org with ESMTP id S265575AbTIDV3m (ORCPT ); Thu, 4 Sep 2003 17:29:42 -0400 Date: Thu, 4 Sep 2003 14:30:43 -0700 From: William Lee Irwin III To: Rik van Riel Cc: "Martin J. Bligh" , Alan Cox , Bernd Eckenfels , Linux Kernel Mailing List Subject: Re: Scaling noise Message-ID: <20030904213043.GH4306@holomorphy.com> Mail-Followup-To: William Lee Irwin III , Rik van Riel , "Martin J. Bligh" , Alan Cox , Bernd Eckenfels , Linux Kernel Mailing List References: <25950000.1062601832@[10.10.2.4]> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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 Thu, Sep 04, 2003 at 04:36:56PM -0400, Rik van Riel wrote: > You'll end up with half your accesses being 15 times as > slow, meaning that your average memory access time is 8 > times as high! Good way to REDUCE performance, but most > people won't like that... > If the NUMA factor is low enough that applications can > treat it like SMP, then the kernel NUMA support won't > have to be very high either... This does not hold. The data set is not necessarily where the communication occurs. -- wli