From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760108AbYFDRZX (ORCPT ); Wed, 4 Jun 2008 13:25:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753684AbYFDRZJ (ORCPT ); Wed, 4 Jun 2008 13:25:09 -0400 Received: from smtp-out04.alice-dsl.net ([88.44.63.6]:17942 "EHLO smtp-out04.alice-dsl.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753493AbYFDRZI (ORCPT ); Wed, 4 Jun 2008 13:25:08 -0400 To: FUJITA Tomonori Cc: linux-kernel@vger.kernel.org, mgross@linux.intel.com, linux-scsi@vger.kernel.org Subject: Re: Intel IOMMU (and IOMMU for Virtualization) performances From: Andi Kleen References: <20080604235053K.fujita.tomonori@lab.ntt.co.jp> Date: Wed, 04 Jun 2008 18:56:35 +0200 In-Reply-To: <20080604235053K.fujita.tomonori@lab.ntt.co.jp> (FUJITA Tomonori's message of "Wed, 4 Jun 2008 23:47:01 +0900") Message-ID: <873antuojg.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: 04 Jun 2008 17:17:34.0737 (UTC) FILETIME=[E1350010:01C8C666] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org FUJITA Tomonori writes: > > I'm just interested in other people's opinions on IOMMU > implementations, performances, possible future changes for performance > improvement, etc. I think using the bitmap is an excellent idea and your numbers look good. Do you have numbers on the memory consumption too? Trading some memory for performance is ok for something as performance critical as the IOMMU. -Andi