Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755779AbZJFA3n (ORCPT ); Mon, 5 Oct 2009 20:29:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755280AbZJFA3n (ORCPT ); Mon, 5 Oct 2009 20:29:43 -0400 Received: from mga14.intel.com ([143.182.124.37]:1759 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754966AbZJFA3m convert rfc822-to-8bit (ORCPT ); Mon, 5 Oct 2009 20:29:42 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.44,509,1249282800"; d="scan'208";a="195424166" From: "Kay, Allen M" To: Jesse Barnes , Chris Wright CC: Chris Wright , "linux-kernel@vger.kernel.org" , "linux-pci@vger.kernel.org" , "matthew@wil.cx" Date: Mon, 5 Oct 2009 17:29:03 -0700 Subject: RE: [PATCH ACS v3 1/1] Thread-Topic: [PATCH ACS v3 1/1] Thread-Index: AcpGGfwXi5dPIhBKRAC+ccPQ5wpCTwAAHmgA Message-ID: <57C9024A16AD2D4C97DC78E552063EA3E3021D49@orsmsx505.amr.corp.intel.com> References: <1253231193-5753-1-git-send-email-allen.m.kay@intel.com> <20090929000041.GB3958@sequoia.sous-sol.org> <57C9024A16AD2D4C97DC78E552063EA3E2EA3B70@orsmsx505.amr.corp.intel.com> <20090929184650.GF3958@sequoia.sous-sol.org> <57C9024A16AD2D4C97DC78E552063EA3E2F0411F@orsmsx505.amr.corp.intel.com> <20091001011721.GK3958@sequoia.sous-sol.org> <20091005171419.5464502d@jbarnes-g45> In-Reply-To: <20091005171419.5464502d@jbarnes-g45> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1623 Lines: 42 Jesse, I will send you a replacement patch since the size of the patch is not so big. Allen -----Original Message----- From: Jesse Barnes [mailto:jbarnes@virtuousgeek.org] Sent: Monday, October 05, 2009 5:14 PM To: Chris Wright Cc: Kay, Allen M; Chris Wright; linux-kernel@vger.kernel.org; linux-pci@vger.kernel.org; matthew@wil.cx Subject: Re: [PATCH ACS v3 1/1] On Wed, 30 Sep 2009 18:17:21 -0700 Chris Wright wrote: > * Kay, Allen M (allen.m.kay@intel.com) wrote: > > On the other hand, can we say VT-d PT mode is mainly for KVM > > virtualization use case? If so, is it reasonable to say > > performance of host P2P in this mode is not of highest priority? > > Guess it depends on the workload. Would be helpful to identify a use > case that is p2p heavy (and then the impact of enabling ACS). > > > If not, another option is to have a kernel boot parameter to > > configure an kernel boot instance to be either host kernel > > optimized or virtualization optimized. I don't know whether this > > is a reasonable or not ... > > I was thinking that ACS could be enabled if an IOMMU is enabled. Not > a perfect fit, but seems reasonably close. Allen, did you want to do these changes as an incremental patch on your last one or just send me a replacement? Either way is fine with me. -- Jesse Barnes, Intel Open Source Technology Center -- 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/