Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758374AbXFZPFz (ORCPT ); Tue, 26 Jun 2007 11:05:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756197AbXFZPFq (ORCPT ); Tue, 26 Jun 2007 11:05:46 -0400 Received: from mga07.intel.com ([143.182.124.22]:30770 "EHLO azsmga101.ch.intel.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755957AbXFZPFp (ORCPT ); Tue, 26 Jun 2007 11:05:45 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.16,463,1175497200"; d="scan'208";a="243520701" Message-ID: <46812ADF.3060609@linux.intel.com> Date: Tue, 26 Jun 2007 08:03:59 -0700 From: Arjan van de Ven User-Agent: Thunderbird 1.5 (Windows/20051201) MIME-Version: 1.0 To: Muli Ben-Yehuda CC: Andi Kleen , Andrew Morton , "Keshavamurthy, Anil S" , linux-kernel@vger.kernel.org, gregkh@suse.de, suresh.b.siddha@intel.com, ashok.raj@intel.com, davem@davemloft.net, clameter@sgi.com Subject: Re: [Intel IOMMU 00/10] Intel IOMMU support, take #2 References: <20070619213701.219910000@askeshav-devel.jf.intel.com> <20070625234550.058635cb.akpm@linux-foundation.org> <200706260912.45838.ak@suse.de> <20070626111324.GB4320@rhun.ibm.com> In-Reply-To: <20070626111324.GB4320@rhun.ibm.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 591 Lines: 12 Muli Ben-Yehuda wrote: > How much? we have numbers (to be presented at OLS later this week) > that show that on bare-metal an IOMMU can cost as much as 15%-30% more > CPU utilization for an IO intensive workload (netperf). It will be > interesting to see comparable numbers for VT-d. for VT-d it is a LOT less. I'll let anil give you his data :) - 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/