Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S270082AbTGWLZI (ORCPT ); Wed, 23 Jul 2003 07:25:08 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S270085AbTGWLZI (ORCPT ); Wed, 23 Jul 2003 07:25:08 -0400 Received: from dsl2.external.hp.com ([192.25.206.7]:62725 "EHLO dsl2.external.hp.com") by vger.kernel.org with ESMTP id S270082AbTGWLZC (ORCPT ); Wed, 23 Jul 2003 07:25:02 -0400 Date: Wed, 23 Jul 2003 05:40:06 -0600 From: Grant Grundler To: "David S. Miller" Cc: grundler@parisc-linux.org, 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 Message-ID: <20030723114006.GA28688@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> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20030708.152314.115928676.davem@redhat.com> User-Agent: Mutt/1.3.28i X-Home-Page: http://www.parisc-linux.org/ Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1473 Lines: 37 On Tue, Jul 08, 2003 at 03:23:14PM -0700, David S. Miller wrote: > 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, Without more specific guidance, dbench looks like a load of crap. "dbench 50" is claiming 850MB/s throughput on a system with 1 disk @ u320 and 2 disks on a seperate 40 MB/s (Ultra Wide SE SCSI). More details are appended below. I'll try again with lmbench or bonnie. Andi, if you could pass me details about the "reaim new dbase" (ie how many devices I need, where to get it) I could make time to try that in the next couple of weeks. > 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 :) yes - James Bottomley was asking for the same info. thanks, grant - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/