Date: Sat, 11 Oct 2008 12:26:29 -0400 From: Adam McDougall <mcdouga9@egr.msu.edu> To: Jeremy Chadwick <koitsu@FreeBSD.org> Cc: freebsd-stable@freebsd.org, freebsd-amd64@freebsd.org Subject: Re: am2 MBs - 4g + SCSI wipes out root partition Message-ID: <48F0D3B5.6070602@egr.msu.edu> In-Reply-To: <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> <20081011144817.GB64861@icarus.home.lan>
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Jeremy Chadwick wrote: > On Sat, Oct 11, 2008 at 04:45:29PM +0200, Gary Jennejohn wrote: >> On Sat, 11 Oct 2008 03:13:16 -0700 >> Jeremy Chadwick <koitsu@FreeBSD.org> wrote: >> >>> On Sat, Oct 11, 2008 at 11:30:57AM +0200, Gary Jennejohn wrote: >>>> On Fri, 10 Oct 2008 14:29:37 -0300 >>>> JoaoBR <joao@matik.com.br> 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. > I am using some LSI (mpt driver) ultra4 (U320 scsi) and LSI SAS controllers in FreeBSD 7.x amd64 with 20G of ram, and Adaptec (aac driver) with a 5th generation RAID card with 8G of ram, both have no such corruption problems. Providing this as a counter-example just to document some evidence of which products seem to work fine.
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