From owner-freebsd-stable@FreeBSD.ORG Sat Oct 11 14:48:19 2008 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 7DE4D106568E for ; Sat, 11 Oct 2008 14:48:19 +0000 (UTC) (envelope-from jdc@koitsu.dyndns.org) Received: from QMTA03.westchester.pa.mail.comcast.net (qmta03.westchester.pa.mail.comcast.net [76.96.62.32]) by mx1.freebsd.org (Postfix) with ESMTP id 263E98FC0A for ; Sat, 11 Oct 2008 14:48:19 +0000 (UTC) (envelope-from jdc@koitsu.dyndns.org) Received: from OMTA02.westchester.pa.mail.comcast.net ([76.96.62.19]) by QMTA03.westchester.pa.mail.comcast.net with comcast id RRVk1a0050QuhwU53SoJgW; Sat, 11 Oct 2008 14:48:18 +0000 Received: from koitsu.dyndns.org ([69.181.141.110]) by OMTA02.westchester.pa.mail.comcast.net with comcast id RSoH1a0082P6wsM3NSoHUl; Sat, 11 Oct 2008 14:48:18 +0000 X-Authority-Analysis: v=1.0 c=1 a=n07WsRzhiL8A:10 a=ORw6YhE72dwA:10 a=QycZ5dHgAAAA:8 a=a0NqNt3ENnTQlbUPBCEA:9 a=qGFGzOOIXX-SBOklsKVT181C0C4A:4 a=EoioJ0NPDVgA:10 a=SV7veod9ZcQA:10 a=LY0hPdMaydYA:10 Received: by icarus.home.lan (Postfix, from userid 1000) id 0DDA9C9419; Sat, 11 Oct 2008 07:48:17 -0700 (PDT) Date: Sat, 11 Oct 2008 07:48:17 -0700 From: Jeremy Chadwick To: Gary Jennejohn Message-ID: <20081011144817.GB64861@icarus.home.lan> References: <200810101429.37244.joao@matik.com.br> <20081011113057.7402300c@ernst.jennejohn.org> <20081011101316.GA58119@icarus.home.lan> <20081011164529.198f32c6@ernst.jennejohn.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20081011164529.198f32c6@ernst.jennejohn.org> User-Agent: Mutt/1.5.18 (2008-05-17) Cc: freebsd-stable@freebsd.org, JoaoBR , freebsd-amd64@freebsd.org Subject: Re: am2 MBs - 4g + SCSI wipes out root partition X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 11 Oct 2008 14:48:19 -0000 On Sat, Oct 11, 2008 at 04:45:29PM +0200, Gary Jennejohn wrote: > On Sat, 11 Oct 2008 03:13:16 -0700 > Jeremy Chadwick wrote: > > > On Sat, Oct 11, 2008 at 11:30:57AM +0200, Gary Jennejohn wrote: > > > On Fri, 10 Oct 2008 14:29:37 -0300 > > > JoaoBR wrote: > > > > > > > I tried MBs as Asus, Abit and Gigabyte all same result > > > > > > > > Same hardware with SATA works perfect > > > > > > > > Same hardware with scsi up to 3.5Gigs installed works perfect > > > > > > > > what calls my attention that all this MBs do not have the memroy hole > > > > remapping feature so the complete 4gigs are available what normally was not > > > > the case with amd64 Mbs for the Athlon 64 CPUs > > > > > > > > some has an opinion if this is a freebsd issue or MB falure or scsi drv > > > > problem? > > > > > > > > > > It's a driver problem. If you want to use SCSI then you'll have to limit > > > memory to 3.5 GB. > > > > What you're saying is that Adaptec and LSI Logic SCSI controllers behave > > badly (and can cause data loss) on amd64 systems which contain more than > > 3.5GB of RAM. This is a very big claim. > > > > Have you talked to Scott Long about this? > > > > Please expand on this, and provide evidence or references. I need to > > document this in my Wiki if it is indeed true. > > > > See the freebsd-scsi thread with Subject "data corruption with ahc driver > and 4GB of memory using a FBSD-8 64-bit installation?" from Wed, 30 Jan > 2008. > > This was for ahc, but the bit-rot which Scott mentions in his reply might > also apply to the LSI Logic controllers. > > Basically the driver doesn't correctly handle DMA above 4GB. Since the PCI > hole gets mapped above 4GB it causes problems. the (S)ATA drivers don't seem > to have this problem. Thank you -- this is the exact information I was looking for. I will update my Wiki page to reflect this quite major problem. -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |