linux-kernel - Re: how to get a DMA channel near a process?

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Message-ID: <4A94C8DF.4030406@inria.fr>
Date:	Wed, 26 Aug 2009 07:32:15 +0200
From:	Brice Goglin <Brice.Goglin@...ia.fr>
To:	Robert Hancock <hancockrwd@...il.com>
CC:	Dan Williams <dan.j.williams@...el.com>,
	Maciej Sosnowski <maciej.sosnowski@...el.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: how to get a DMA channel near a process?

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

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