From owner-freebsd-questions@FreeBSD.ORG  Tue Aug 16 18:47:49 2005
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
X-Original-To: freebsd-questions@freebsd.org
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 3806216A41F
	for <freebsd-questions@freebsd.org>;
	Tue, 16 Aug 2005 18:47:49 +0000 (GMT)
	(envelope-from nikolas.britton@gmail.com)
Received: from wproxy.gmail.com (wproxy.gmail.com [64.233.184.205])
	by mx1.FreeBSD.org (Postfix) with ESMTP id B4AE343D48
	for <freebsd-questions@freebsd.org>;
	Tue, 16 Aug 2005 18:47:48 +0000 (GMT)
	(envelope-from nikolas.britton@gmail.com)
Received: by wproxy.gmail.com with SMTP id i8so9870wra
	for <freebsd-questions@freebsd.org>;
	Tue, 16 Aug 2005 11:47:41 -0700 (PDT)
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com;
	h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references;
	b=EsbN9XUYL9MYA3za7DKO8XZuUxYrsyVXP+W3He4DAYjG0y3BiNydKRU/p3tI0HlhP4RuSsU+DyjyqBhnyHgGZcVwi4T6PLaNIXmQDWCifde3JIUAya9WsirW4j6k3N+vScNRsVb8b5TeGnmmSbuUccYzSv4raP69o2PtCuLPKEE=
Received: by 10.54.34.61 with SMTP id h61mr4477931wrh;
	Tue, 16 Aug 2005 11:47:41 -0700 (PDT)
Received: by 10.54.124.11 with HTTP; Tue, 16 Aug 2005 11:47:41 -0700 (PDT)
Message-ID: <ef10de9a05081611474f0d9a30@mail.gmail.com>
Date: Tue, 16 Aug 2005 13:47:41 -0500
From: Nikolas Britton <nikolas.britton@gmail.com>
To: Dick Hoogendijk <dick@nagual.st>
In-Reply-To: <20050816082409.GA45012@lothlorien.nagual.st>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline
References: <20050816082409.GA45012@lothlorien.nagual.st>
Cc: freebsd-questions <freebsd-questions@freebsd.org>
Subject: Re: atacontrol
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 16 Aug 2005 18:47:49 -0000

On 8/16/05, Dick Hoogendijk <dick@nagual.st> wrote:
> I have a simple question. Some time ago I was told always to use the
> same type of harddisk transfers. Now I have i.e.:
>=20
> Master =3D UDMA100
> Slave  =3D UDMA66
>=20
> Does this mean the first disk really works on UDMA100 or is is delayed
> by the second one (as I was told some time ago).
>=20
> Or is the fbsd ata controller capable of setting each drive to its
> right speed?

AFAIK everything slows down. This is a hardware problem and FreeBSD
can do nothing about it. This is why I only put one device on a
controller/channel, I also do it because the controller can only talk
to one device at a time.