From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267818AbTGHWSI (ORCPT ); Tue, 8 Jul 2003 18:18:08 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267822AbTGHWSH (ORCPT ); Tue, 8 Jul 2003 18:18:07 -0400 Received: from pizda.ninka.net ([216.101.162.242]:6046 "EHLO pizda.ninka.net") by vger.kernel.org with ESMTP id S267818AbTGHWQx (ORCPT ); Tue, 8 Jul 2003 18:16:53 -0400 Date: Tue, 08 Jul 2003 15:23:14 -0700 (PDT) Message-Id: <20030708.152314.115928676.davem@redhat.com> To: grundler@parisc-linux.org Cc: ak@suse.de, 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 From: "David S. Miller" In-Reply-To: <20030708222545.GC6787@dsl2.external.hp.com> References: <20030708213427.39de0195.ak@suse.de> <20030708.150433.104048841.davem@redhat.com> <20030708222545.GC6787@dsl2.external.hp.com> X-FalunGong: Information control. X-Mailer: Mew version 2.1 on Emacs 21.1 / Mule 5.0 (SAKAKI) 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 From: Grant Grundler Date: Tue, 8 Jul 2003 16:25:45 -0600 On Tue, Jul 08, 2003 at 03:04:33PM -0700, David S. Miller wrote: > Do you know a common PCI block device that would benefit from this > (performs significantly better with short sg lists)? It would be > interesting to test. > > %10 to %15 on sym53c8xx devices found on sparc64 boxes. Which workload? dbench type stuff, but that's a hard thing to test these days with the block I/O schedulers changing so much. Try to keep that part constant in the with/vs/without VIO_VMERGE!=0 testing :)