From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 30 May 2001 05:56:17 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 30 May 2001 05:56:07 -0400 Received: from ns.virtualhost.dk ([195.184.98.160]:1040 "EHLO virtualhost.dk") by vger.kernel.org with ESMTP id ; Wed, 30 May 2001 05:56:01 -0400 Date: Wed, 30 May 2001 11:55:38 +0200 From: Jens Axboe To: Mark Hemment Cc: Linux Kernel , riel@conectiva.com.br, andrea@e-mind.com Subject: Re: [patch] 4GB I/O, cut three Message-ID: <20010530115538.B15089@suse.de> In-Reply-To: <20010529160704.N26871@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: ; from markhe@veritas.com on Wed, May 30, 2001 at 10:43:33AM +0100 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, May 30 2001, Mark Hemment wrote: > Hi Jens, > > I ran this (well, cut-two) on a 4-way box with 4GB of memory and a > modified qlogic fibre channel driver with 32disks hanging off it, without > any problems. The test used was SpecFS 2.0 Cool, could you send me the qlogic diff? It's the one-liner can_dma32 chance I'm interested in, I'm just not sure what driver you used :-) I'll add that to the patch then. Basically all the PCI cards should work, I'm just being cautious and only enabling highmem I/O to the ones that have been tested. > Peformance is definitely up - but I can't give an exact number, as the > run with this patch was compiled with no-omit-frame-pointer for debugging > any probs. Good > I did change the patch so that bounce-pages always come from the NORMAL > zone, hence the ZONE_DMA32 zone isn't needed. I avoided the new zone, as > I'm not 100% sure the VM is capable of keeping the zones it already has > balanced - and adding another one might break the camels back. But as the > test box has 4GB, it wasn't bouncing anyway. You are right, this is definitely something that needs checking. I really want this to work though. Rik, Andrea? Will the balancing handle the extra zone? -- Jens Axboe