Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755350AbZJABRZ (ORCPT ); Wed, 30 Sep 2009 21:17:25 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755336AbZJABRX (ORCPT ); Wed, 30 Sep 2009 21:17:23 -0400 Received: from sous-sol.org ([216.99.217.87]:57563 "EHLO sequoia.sous-sol.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755300AbZJABRX (ORCPT ); Wed, 30 Sep 2009 21:17:23 -0400 Date: Wed, 30 Sep 2009 18:17:21 -0700 From: Chris Wright To: "Kay, Allen M" Cc: Chris Wright , "linux-kernel@vger.kernel.org" , "linux-pci@vger.kernel.org" , "jbarnes@virtuousgeek.org" , "matthew@wil.cx" Subject: Re: [PATCH ACS v3 1/1] Message-ID: <20091001011721.GK3958@sequoia.sous-sol.org> 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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <57C9024A16AD2D4C97DC78E552063EA3E2F0411F@orsmsx505.amr.corp.intel.com> User-Agent: Mutt/1.5.19 (2009-01-05) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 965 Lines: 23 * 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. thanks, -chris -- 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/