From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sun, 23 Jun 2002 03:31:08 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sun, 23 Jun 2002 03:31:07 -0400 Received: from e2.ny.us.ibm.com ([32.97.182.102]:28586 "EHLO e2.ny.us.ibm.com") by vger.kernel.org with ESMTP id ; Sun, 23 Jun 2002 03:31:06 -0400 Message-ID: <3D1578D3.20909@us.ibm.com> Date: Sun, 23 Jun 2002 00:29:23 -0700 From: Dave Hansen User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.0) Gecko/20020607 X-Accept-Language: en-us, en MIME-Version: 1.0 To: William Lee Irwin III CC: "Christopher E. Brown" , Andreas Dilger , "Griffiths, Richard A" , "'Andrew Morton'" , mgross@unix-os.sc.intel.com, "'Jens Axboe'" , Linux Kernel Mailing List , lse-tech@lists.sourceforge.net Subject: Re: [Lse-tech] Re: ext3 performance bottleneck as the number of spindles gets large References: <20020623043310.GL22411@clusterfs.com> <20020623063543.GH25360@holomorphy.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org William Lee Irwin III wrote: > On Sun, Jun 23, 2002 at 12:00:01AM -0600, Christopher E. Brown wrote: > >>However, multiple busses are *rare* on x86. There are alot of chained >>busses via PCI to PCI bridge, but few systems with 2 or more PCI >>busses of any type with parallel access to the CPU. > > NUMA-Q has them. > Yep, 2 independent busses per quad. That's a _lot_ of busses when you have an 8 or 16 quad system. (I wonder who has one of those... ;) Almost all of the server-type boxes that we play with have multiple PCI busses. Even my old dual-PPro has 2. -- Dave Hansen haveblue@us.ibm.com