From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758290Ab1EaT5m (ORCPT ); Tue, 31 May 2011 15:57:42 -0400 Received: from hyde.gogi.tv ([87.106.161.174]:60563 "EHLO hyde.gogi.tv" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757862Ab1EaT5l (ORCPT ); Tue, 31 May 2011 15:57:41 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Date: Tue, 31 May 2011 20:57:39 +0100 From: Daniel Haid To: Konrad Rzeszutek Wilk Cc: Subject: Re: Question about iommu on =?UTF-8?Q?x=38=36=5F=36=34=20and=20ra?= =?UTF-8?Q?deon=20driver=2E?= In-Reply-To: <20110531190412.GA21245@dumpdata.com> References: <08370791664f069624d25c757ed101c0@admin.gogi.tv> <20110525125752.GB3467@dumpdata.com> <20110527155507.GB11273@dumpdata.com> <9e26ea71798d10a3f900c777b71ff485@admin.gogi.tv> <20110531134519.GC14641@dumpdata.com> <59be1730ec1660abeb7b4dc584510d34@admin.gogi.tv> <20110531160221.GA31659@dumpdata.com> <0a8cb4bcad7fcf091a6bbe158323bba0@admin.gogi.tv> <20110531190412.GA21245@dumpdata.com> Message-ID: User-Agent: Roundcube Webmail/0.4.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Just another question, the problem seems to be an issue with swiotlb=force and I assume that without "force" DMA with addresses that already are below 4GB should be handled without any bounce-buffer, and with "force" everything goes through the bounce-buffer, is this correct? Now I have a VIA chipset where the IOMMU does not work, so swiotlb is activated, but is it activated in force mode or in normal mode? How can I find out? If it is activated in force mode, maybe the problem will go away in normal mode?