From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756754AbZHZFus (ORCPT ); Wed, 26 Aug 2009 01:50:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756673AbZHZFur (ORCPT ); Wed, 26 Aug 2009 01:50:47 -0400 Received: from iona.labri.fr ([147.210.8.143]:58678 "EHLO iona.labri.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756634AbZHZFuq (ORCPT ); Wed, 26 Aug 2009 01:50:46 -0400 X-Greylist: delayed 1147 seconds by postgrey-1.27 at vger.kernel.org; Wed, 26 Aug 2009 01:50:46 EDT Message-ID: <4A94C8DF.4030406@inria.fr> Date: Wed, 26 Aug 2009 07:32:15 +0200 From: Brice Goglin User-Agent: Mozilla-Thunderbird 2.0.0.19 (X11/20090103) MIME-Version: 1.0 To: Robert Hancock CC: Dan Williams , Maciej Sosnowski , LKML Subject: Re: how to get a DMA channel near a process? References: <4A93E192.9000109@inria.fr> <4A94C5B6.3060907@gmail.com> In-Reply-To: <4A94C5B6.3060907@gmail.com> X-Enigmail-Version: 0.95.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Robert Hancock wrote: > On 08/25/2009 07:05 AM, Brice Goglin wrote: >> Hello, >> >> I am playing with DMA engine on a Nehalem box with two X58 chipsets >> (Supermicro X8DAH). My understanding is that there are 8 DMA channels on >> each chipset, so 8 channels near each processor. Unfortunately, my BIOS > > Don't think that DMA channel is the term you are looking for, maybe > PCI Express lanes? DMA channels are an ancient ISA thing. Talking about DMA Engine devices/channels such as Intel I/OAT. See include/linux/dmaengine.h Brice