Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761167AbYF0SzV (ORCPT ); Fri, 27 Jun 2008 14:55:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754915AbYF0SzG (ORCPT ); Fri, 27 Jun 2008 14:55:06 -0400 Received: from smtp-out04.alice-dsl.net ([88.44.63.6]:42090 "EHLO smtp-out04.alice-dsl.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753136AbYF0SzF (ORCPT ); Fri, 27 Jun 2008 14:55:05 -0400 To: Joerg Roedel Cc: Muli Ben-Yehuda , Adrian Bunk , Joerg Roedel , tglx@linutronix.de, mingo@redhat.com, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, bhavna.sarathy@amd.com, Sebastian.Biemueller@amd.com, robert.richter@amd.com Subject: Re: [PATCH 01/34] AMD IOMMU: add Kconfig entry From: Andi Kleen References: <1214508490-29683-1-git-send-email-joerg.roedel@amd.com> <1214508490-29683-2-git-send-email-joerg.roedel@amd.com> <20080627142558.GG18644@cs181140183.pp.htv.fi> <878wwrq6im.fsf@basil.nowhere.org> <20080627163945.GA26130@il.ibm.com> <20080627165430.GD10197@8bytes.org> Date: Fri, 27 Jun 2008 20:54:59 +0200 In-Reply-To: <20080627165430.GD10197@8bytes.org> (Joerg Roedel's message of "Fri, 27 Jun 2008 18:54:30 +0200") Message-ID: <87zlp6pv24.fsf@basil.nowhere.org> User-Agent: Gnus/5.1008 (Gnus v5.10.8) Emacs/21.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-OriginalArrivalTime: 27 Jun 2008 18:47:40.0257 (UTC) FILETIME=[46A62510:01C8D886] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1041 Lines: 25 Joerg Roedel writes: > On Fri, Jun 27, 2008 at 12:39:45PM -0400, Muli Ben-Yehuda wrote: >> On Fri, Jun 27, 2008 at 04:47:29PM +0200, Andi Kleen wrote: >> >> > Also it should ideally describe that there is a trade off between >> > reliability and performance with IOMMU enabled. >> >> I agree that there's a performance tradeoff with current generation >> hardware and ingerfaces, but it wouldn't be fair to single out a >> single IOMMU implementation ;=) > > True. At least for the case without device isolation I have some > optimizations in mind which will minimize the performance tradeoff. I > hope to have them ready for 2.6.28 :) Not sure that would be very useful. Outside of virtualization device isolation is the main feature of an IOMMU on a native kernel. -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/