Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964959AbWACV1O (ORCPT ); Tue, 3 Jan 2006 16:27:14 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S964914AbWACV0Y (ORCPT ); Tue, 3 Jan 2006 16:26:24 -0500 Received: from mx1.suse.de ([195.135.220.2]:43414 "EHLO mx1.suse.de") by vger.kernel.org with ESMTP id S964883AbWACV0J convert rfc822-to-8bit (ORCPT ); Tue, 3 Jan 2006 16:26:09 -0500 To: "=?iso-8859-1?q?Dieter_St=FCken?= <43BA4C3D.4060206@conterra.de> <43BAE7E3.6070504@conterra.de> From: Andi Kleen Date: 03 Jan 2006 22:26:06 +0100 In-Reply-To: <43BAE7E3.6070504@conterra.de> Message-ID: User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1340 Lines: 32 Dieter St?ken writes: [can you please not always drop me from cc with each reply?] Dieter Stüken writes: > OK, here are my last results for today: > > using "iommu=allowed" did not work. System freezes during initialization > of the PDC20318, which is on the external PCI bus. > > But swiotlb=force works well! This means your PCI bridge doesn't support addresses >4GB. > The pci-gart.c patch seems to disable dma. Only DMA for addresses >4GB. > Is this the DMA my PCI devices > perform them self? As I learned, they may perform DMA even above 4g if all > works well. Thus I may be happy without any IOMMU. As I saw my system working > even without this patch, I will turn back to the original 2.6.15-rc7 an continue > running this torture test during this night. The patch should perform slightly better than swiotlb=force because it will only force bounce buffering for addresses >4GB. If your torture test involves more than 64MB of IO in flight you might also need to increase the bounce buffer area with swiotlb=128M or somesuch. -Andi - 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/