From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S272731AbTG3Ey4 (ORCPT ); Wed, 30 Jul 2003 00:54:56 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S272735AbTG3Ey4 (ORCPT ); Wed, 30 Jul 2003 00:54:56 -0400 Received: from pizda.ninka.net ([216.101.162.242]:7111 "EHLO pizda.ninka.net") by vger.kernel.org with ESMTP id S272731AbTG3Eyz (ORCPT ); Wed, 30 Jul 2003 00:54:55 -0400 Date: Tue, 29 Jul 2003 21:51:18 -0700 From: "David S. Miller" To: Grant Grundler Cc: ak@suse.de, grundler@parisc-linux.org, alan@lxorguk.ukuu.org.uk, James.Bottomley@SteelEye.com, axboe@suse.de, suparna@in.ibm.com, linux-kernel@vger.kernel.org, alex_williamson@hp.com, bjorn_helgaas@hp.com Subject: Re: [RFC] block layer support for DMA IOMMU bypass mode II Message-Id: <20030729215118.13a5ac18.davem@redhat.com> In-Reply-To: <20030730044256.GA1974@dsl2.external.hp.com> References: <20030708213427.39de0195.ak@suse.de> <20030708.150433.104048841.davem@redhat.com> <20030708222545.GC6787@dsl2.external.hp.com> <20030708.152314.115928676.davem@redhat.com> <20030723114006.GA28688@dsl2.external.hp.com> <20030728131513.5d4b1bd3.ak@suse.de> <20030730044256.GA1974@dsl2.external.hp.com> X-Mailer: Sylpheed version 0.9.2 (GTK+ 1.2.6; sparc-unknown-linux-gnu) 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 On Tue, 29 Jul 2003 22:42:56 -0600 Grant Grundler wrote: > On Mon, Jul 28, 2003 at 01:15:13PM +0200, Andi Kleen wrote: > > Run it with 100-500 users (reaim -f workfile... -s 100 -e 500 -i 100) > > jejb was wondering if 4k pages would cause different behaviors becuase > of file system vs page size (4k vs 16k). ia64 uses 16k by default. > I've rebuilt the kernel with 4k page size and VMERGE != 0. > The substantially worse performance feels like a rat hole because > of 4x pressure on CPU TLB. Make an ext2 filesystem with 16K blocks :-)