From owner-freebsd-amd64@FreeBSD.ORG Sat Oct 11 14:45:35 2008 Return-Path: Delivered-To: freebsd-amd64@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id EF9301065691; Sat, 11 Oct 2008 14:45:35 +0000 (UTC) (envelope-from gary.jennejohn@freenet.de) Received: from mout2.freenet.de (mout2.freenet.de [IPv6:2001:748:100:40::2:4]) by mx1.freebsd.org (Postfix) with ESMTP id 881798FC17; Sat, 11 Oct 2008 14:45:35 +0000 (UTC) (envelope-from gary.jennejohn@freenet.de) Received: from [195.4.92.21] (helo=11.mx.freenet.de) by mout2.freenet.de with esmtpa (ID gary.jennejohn@freenet.de) (port 25) (Exim 4.69 #65) id 1Kofim-000458-Mj; Sat, 11 Oct 2008 16:45:32 +0200 Received: from ra1a5.r.pppool.de ([89.54.161.165]:49737 helo=ernst.jennejohn.org) by 11.mx.freenet.de with esmtpa (ID gary.jennejohn@freenet.de) (port 25) (Exim 4.69 #65) id 1Kofim-00076e-F1; Sat, 11 Oct 2008 16:45:32 +0200 Date: Sat, 11 Oct 2008 16:45:29 +0200 From: Gary Jennejohn To: Jeremy Chadwick Message-ID: <20081011164529.198f32c6@ernst.jennejohn.org> In-Reply-To: <20081011101316.GA58119@icarus.home.lan> References: <200810101429.37244.joao@matik.com.br> <20081011113057.7402300c@ernst.jennejohn.org> <20081011101316.GA58119@icarus.home.lan> X-Mailer: Claws Mail 3.5.0 (GTK+ 2.12.11; amd64-portbld-freebsd8.0) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: freebsd-stable@freebsd.org, freebsd-amd64@freebsd.org Subject: Re: am2 MBs - 4g + SCSI wipes out root partition X-BeenThere: freebsd-amd64@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: gary.jennejohn@freenet.de List-Id: Porting FreeBSD to the AMD64 platform List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 11 Oct 2008 14:45:36 -0000 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. --- Gary Jennejohn