Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756841AbZLWTvA (ORCPT ); Wed, 23 Dec 2009 14:51:00 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756593AbZLWTu5 (ORCPT ); Wed, 23 Dec 2009 14:50:57 -0500 Received: from one.firstfloor.org ([213.235.205.2]:52251 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754151AbZLWTux (ORCPT ); Wed, 23 Dec 2009 14:50:53 -0500 To: "Ira W. Snyder" Cc: Gregory Haskins , Kyle Moffett , Ingo Molnar , Avi Kivity , kvm@vger.kernel.org, Andrew Morton , torvalds@linux-foundation.org, "linux-kernel@vger.kernel.org" , netdev@vger.kernel.org, "alacrityvm-devel@lists.sourceforge.net" Subject: Re: [GIT PULL] AlacrityVM guest drivers for 2.6.33 From: Andi Kleen References: <4B1D4F29.8020309@gmail.com> <20091218215107.GA14946@elte.hu> <4B2F9582.5000002@gmail.com> <20091222075742.GB26467@elte.hu> <4B3103B4.4070708@gmail.com> <4B3254B4.2080602@gmail.com> <20091223192808.GA30700@ovro.caltech.edu> Date: Wed, 23 Dec 2009 20:50:52 +0100 In-Reply-To: <20091223192808.GA30700@ovro.caltech.edu> (Ira W. Snyder's message of "Wed, 23 Dec 2009 11:28:08 -0800") Message-ID: <873a31cvvn.fsf@basil.nowhere.org> User-Agent: Gnus/5.1008 (Gnus v5.10.8) Emacs/22.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 584 Lines: 16 "Ira W. Snyder" writes: > (You'll quickly find that you must use DMA to transfer data across PCI. > AFAIK, CPU's cannot do burst accesses to the PCI bus. I get a 10+ times AFAIK that's what write-combining on x86 does. DMA has other advantages of course. -Andi -- ak@linux.intel.com -- Speaking for myself only. -- 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/