From owner-freebsd-hackers@FreeBSD.ORG  Fri Nov  2 10:42:07 2007
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@FreeBSD.ORG
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 7565B16A417;
	Fri,  2 Nov 2007 10:42:07 +0000 (UTC) (envelope-from sos@deepcore.dk)
Received: from spider.deepcore.dk
	(cpe.atm2-0-70484.0x50a6c9a6.abnxx16.customer.tele.dk
	[80.166.201.166])
	by mx1.freebsd.org (Postfix) with ESMTP id 0C6AE13C447;
	Fri,  2 Nov 2007 10:42:06 +0000 (UTC) (envelope-from sos@deepcore.dk)
Received: from ws.local (ws.deepcore.dk [194.192.25.137])
	by spider.deepcore.dk (8.13.8/8.13.8) with ESMTP id lA2Af7Ij063961;
	Fri, 2 Nov 2007 11:41:07 +0100 (CET) (envelope-from sos@deepcore.dk)
Message-ID: <472AFEC3.7090001@deepcore.dk>
Date: Fri, 02 Nov 2007 11:41:07 +0100
From: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@deepcore.dk>
User-Agent: Thunderbird 2.0.0.6 (Macintosh/20070728)
MIME-Version: 1.0
To: Alexander Sabourenkov <screwdriver@lxnt.info>
References: <472A548B.50406@lxnt.info> <472AFB75.1070207@deepcore.dk>
In-Reply-To: <472AFB75.1070207@deepcore.dk>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: quoted-printable
Cc: freebsd-hackers@FreeBSD.ORG, sos@FreeBSD.ORG, freebsd-current@FreeBSD.ORG,
	"Matthew D. Fuller" <fullermd@over-yonder.net>,
	Thierry Herbelot <thierry@herbelot.com>
Subject: Re: Patch RFC:  Promise SATA300 TX4 hardware bug workaround.
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 02 Nov 2007 10:42:07 -0000

S=F8ren Schmidt wrote:
> Good catch!
>
> However from my quick glimpse at the Promise sources the limit seems=20
> to be 32 Dwords ie 32*4 =3D 128bytes.
> I'll investigate further and ask Promise for the gory details, stay=20
> tuned...
> I dont think the PRD count limitation is a real problem, I've newer=20
> seen that long a list and IIRC we newer do more than 64K transfers in=20
> one go (yet).
> Anyhow I need to get checks in for that not just here...
>
> Give me a few days and I'll get this figured out for 7-rel...
Oh, and I forgot, do you have a surefire way to reproduce the problem so =

the fix can be tested ?

I've newer been able to trigger this problem myself so far.


-S=F8ren