Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753705AbYLGViW (ORCPT ); Sun, 7 Dec 2008 16:38:22 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751202AbYLGViM (ORCPT ); Sun, 7 Dec 2008 16:38:12 -0500 Received: from yw-out-2324.google.com ([74.125.46.30]:6758 "EHLO yw-out-2324.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751066AbYLGViL (ORCPT ); Sun, 7 Dec 2008 16:38:11 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=LfZ0J1crdlYq+IphNeKKm91ftQFqsSc+kZUqjvE/0u/QRt0TqaYV7ejHCR0GeVME25 MDvMLA2y79A1CkyJDK0EzP1XOn6hNXASDlOistfIo/MxBf05BM8Q1wDdJ0LafdeK6rnf 4wU9Kh+COLasZmL7KWOFc/zf/dJJZsrBgI88c= Message-ID: <12bfabe40812071338y6bb47161le676ac9613b366cd@mail.gmail.com> Date: Sun, 7 Dec 2008 22:38:10 +0100 From: "Giangiacomo Mariotti" To: "Robert Hancock" Subject: Re: [PROBLEM] Hw problem or software bug? DMA: Out of SW-IOMMU space.... Cc: linux-kernel@vger.kernel.org In-Reply-To: <493C1A2C.3080801@shaw.ca> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <12bfabe40812061948w4069e389ub90c4af86a493da6@mail.gmail.com> <493C1A2C.3080801@shaw.ca> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 988 Lines: 19 On Sun, Dec 7, 2008 at 7:47 PM, Robert Hancock wrote: > > Seems like you have lots of disks, it could be you just have too much IO in > flight at the same time for the size of the IOMMU area. You might be able to > avoid that by increasing the SW-IOMMU size. > > However, your system should be AHCI capable, you should try to switch the > SATA controller into that mode in the BIOS (possibly labelled RAID mode or > something). Then it shouldn't need to use bounce buffers for disk access in > the first place (plus give you NCQ support). > I've done what you said, now is there anything I can do to see if the problem is solved? Use some program which produces a lot of IO? Is there any suggested IO stress test available? -- 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/