Date: Mon, 13 Oct 2008 09:37:48 -0200 From: JoaoBR <joao@matik.com.br> To: freebsd-stable@freebsd.org Cc: Adam McDougall <mcdouga9@egr.msu.edu>, Jeremy Chadwick <koitsu@freebsd.org>, freebsd-amd64@freebsd.org Subject: Re: am2 MBs - 4g + SCSI wipes out root partition Message-ID: <200810130937.48093.joao@matik.com.br> In-Reply-To: <48F0D3B5.6070602@egr.msu.edu> References: <200810101429.37244.joao@matik.com.br> <20081011144817.GB64861@icarus.home.lan> <48F0D3B5.6070602@egr.msu.edu>
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On Saturday 11 October 2008 13:26:29 Adam McDougall wrote: > 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 ho= le > >>>>> 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. > _______________________________________________ well this for sure is NOT a AM2 MB but any server MB which indeed run fine = as=20 Tyans, SMs and others I guess =2D-=20 Jo=E3o A mensagem foi scaneada pelo sistema de e-mail e pode ser considerada segura. Service fornecido pelo Datacenter Matik https://datacenter.matik.com.br
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