From owner-freebsd-questions  Sun May 23 14:16:56 1999
Delivered-To: freebsd-questions@freebsd.org
Received: from revolution.3-cities.com (revolution.3-cities.com [204.203.224.155])
	by hub.freebsd.org (Postfix) with ESMTP id E172014C97
	for <freebsd-questions@FreeBSD.ORG>; Sun, 23 May 1999 14:16:54 -0700 (PDT)
	(envelope-from kstewart@3-cities.com)
Received: from 3-cities.com (kenn1164.bossig.com [208.26.241.164])
	by revolution.3-cities.com (8.9.3/8.9.3) with ESMTP id OAA12548;
	Sun, 23 May 1999 14:16:49 -0700 (PDT)
Message-ID: <37487040.45753CA@3-cities.com>
Date: Sun, 23 May 1999 14:16:48 -0700
From: Kent Stewart <kstewart@3-cities.com>
Organization: Columbia Basin Virtual Community Project
X-Mailer: Mozilla 4.51 [en] (WinNT; I)
X-Accept-Language: en
MIME-Version: 1.0
To: Orlando Andico <orly@mozcom.com>
Cc: freebsd-questions@FreeBSD.ORG
Subject: Re: IDE U/DMA on non-Intel chipsets
References: <Pine.BSF.3.96.990524023008.2553A-100000@ice.mozcom.com>
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Sender: owner-freebsd-questions@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

You can either configure the system at boot or add it to your kernel.
The typical setting is "flags 0xa0ffa0ff" but if your are using LBA
that becomes 0xb0ffb0ff. I went from 3.8MB/s to 8MB/s on reads. The
writes were only 1.7 times faster. You can add these parameters to
your wd0 and/or wd1 by booting and configuring.

Kent

Orlando Andico wrote:
> 
> I noticed from searching the mailing list archives that busmastering DMA
> is supported on Intel chipsets. I'm currently using 3.0 at home, and I get
> the following information from my dmesg(1):
> 
> ..
> ide_pci0: <VIA 82C586x (Apollo) Bus-master IDE controller> rev 0x06 on
> pci0.7.1
> ..
> 
> Does this mean that bus-mastering DMA is being used? how can I turn it on
> if not? does a later version support the VIA Apollo? (it's actually an
> Apollo Pro 82C591 on a Slot1 board)
> 
> -------------------------------------------------------------------
> Orlando Andico <orly@mozcom.com>                 +63   (2) 937-2293
> Mosaic Communications, Inc.                      +63 (912) 800-8262
>     Promote bacteria.. it's the only culture some people have.
> 
> To Unsubscribe: send mail to majordomo@FreeBSD.org
> with "unsubscribe freebsd-questions" in the body of the message

-- 
Kent Stewart
Richland, WA

mailto:kstewart@3-cities.com
http://www.3-cities.com/~kstewart/index.html


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-questions" in the body of the message