From owner-freebsd-current@FreeBSD.ORG  Wed Oct  5 08:19:01 2005
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
X-Original-To: freebsd-current@FreeBSD.org
Delivered-To: freebsd-current@FreeBSD.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 8F23416A41F
	for <freebsd-current@FreeBSD.org>; Wed,  5 Oct 2005 08:19:01 +0000 (GMT)
	(envelope-from tataz@tataz.chchile.org)
Received: from smtp1-g19.free.fr (smtp1-g19.free.fr [212.27.42.27])
	by mx1.FreeBSD.org (Postfix) with ESMTP id CBD5C43D5E
	for <freebsd-current@FreeBSD.org>; Wed,  5 Oct 2005 08:18:51 +0000 (GMT)
	(envelope-from tataz@tataz.chchile.org)
Received: from tatooine.tataz.chchile.org
	(vol75-8-82-233-239-98.fbx.proxad.net [82.233.239.98])
	by smtp1-g19.free.fr (Postfix) with ESMTP id 34CDF3A729;
	Wed,  5 Oct 2005 10:18:50 +0200 (CEST)
Received: by tatooine.tataz.chchile.org (Postfix, from userid 1000)
	id 2A9FB4083; Wed,  5 Oct 2005 10:18:41 +0200 (CEST)
Date: Wed, 5 Oct 2005 10:18:41 +0200
From: Jeremie Le Hen <jeremie@le-hen.org>
To: Andrzej Tobola <ato@iem.pw.edu.pl>,
	Pertti Kosunen <pertti.kosunen@pp.nic.fi>
Message-ID: <20051005081840.GK43195@obiwan.tataz.chchile.org>
References: <20050928190336.GA1027@obiwan.tataz.chchile.org>
	<200509281527.33584.mistry.7@osu.edu>
	<20050928202406.GD1027@obiwan.tataz.chchile.org>
	<20050928222849.GA1086@obiwan.tataz.chchile.org>
	<20050929170359.GA31360@amper.iem.pw.edu.pl>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20050929170359.GA31360@amper.iem.pw.edu.pl>
User-Agent: Mutt/1.5.10i
Cc: freebsd-current@FreeBSD.org, Jeremie Le Hen <jeremie@le-hen.org>
Subject: Re: ATA/DMA problem after reboot
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 05 Oct 2005 08:19:01 -0000

Hi Andrzej, Pertti,

> > I tried to disable APIC, S.M.A.R.T, IDE DMA Burst, IDE Block Mode.
> > I don't know what the last one does, but anyway, nothing corrected
> > my problem.
> > 
> > Other suggestions are welcome.
> 
> In my case switching from UDMA33 to WDMA solves the problem,
> but almost halves disk bandwidth (from 28M/s to 18M/s)
> (via # atacontrol mode ad0)
> 
> It seems that there is som nasty timing bug in ATA or system
> so only big bulk transfer are affected

How do I set this at boot time ?  There may be a tunable or something
allowing to do this.  My problem indeed occurs before / is even
mounted.

Regards,
-- 
Jeremie Le Hen
< jeremie at le-hen dot org >< ttz at chchile dot org >