Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755712AbZJFAPH (ORCPT ); Mon, 5 Oct 2009 20:15:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755681AbZJFAPG (ORCPT ); Mon, 5 Oct 2009 20:15:06 -0400 Received: from outbound-mail-15.bluehost.com ([69.89.18.115]:42242 "HELO outbound-mail-15.bluehost.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1755689AbZJFAPF (ORCPT ); Mon, 5 Oct 2009 20:15:05 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=default; d=virtuousgeek.org; h=Received:Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References:X-Mailer:Mime-Version:Content-Type:Content-Transfer-Encoding:X-Identified-User; b=jjr5XaPH2PDYe6dlLnmNDlxKWuWU8PmWKrUskvYzyr88hsf3UG1TH/fgVxsc7QcCCWSDu6EXb2gFlxWEUNf549gNnl1oJ3XBAe71/tlgku5SOfe8YHREiyLWEVakqtJh; Date: Mon, 5 Oct 2009 17:14:19 -0700 From: Jesse Barnes 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] Message-ID: <20091005171419.5464502d@jbarnes-g45> In-Reply-To: <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> <20091001011721.GK3958@sequoia.sous-sol.org> X-Mailer: Claws Mail 3.7.2 (GTK+ 2.17.5; i486-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Identified-User: {10642:box514.bluehost.com:virtuous:virtuousgeek.org} {sentby:smtp auth 75.111.28.251 authed with jbarnes@virtuousgeek.org} Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1254 Lines: 29 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/