Date: Mon, 13 Oct 2008 14:05:31 +0100 From: Tom Evans <tevans.uk@googlemail.com> To: JoaoBR <joao@matik.com.br> Cc: Adam McDougall <mcdouga9@egr.msu.edu>, freebsd-stable@freebsd.org, Jeremy Chadwick <koitsu@freebsd.org>, freebsd-amd64@freebsd.org Subject: Re: am2 MBs - 4g + SCSI wipes out root partition Message-ID: <1223903131.3262.45.camel@localhost> In-Reply-To: <200810130937.48093.joao@matik.com.br> References: <200810101429.37244.joao@matik.com.br> <20081011144817.GB64861@icarus.home.lan> <48F0D3B5.6070602@egr.msu.edu> <200810130937.48093.joao@matik.com.br>
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--=-x730y7oFoCNvm0j+hSsR Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Mon, 2008-10-13 at 09:37 -0200, JoaoBR wrote: > 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 = hole > > >>>>> remapping feature so the complete 4gigs are available what normal= ly > > >>>>> 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 sc= si > > >>>>> drv problem? > > >>>> > > >>>> It's a driver problem. If you want to use SCSI then you'll have t= o > > >>>> 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 conta= in > > >>> 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 W= ed, > > >> 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 drive= rs > > >> 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. > > _______________________________________________ >=20 >=20 > well this for sure is NOT a AM2 MB but any server MB which indeed run fin= e as=20 > Tyans, SMs and others I guess >=20 It sounds like your issue is specific to certain motherboards and BIOS, which would be non driver specific. Unless this is something that can be worked around, I think the 'solution' is that with this hardware, you are limited to 3.5 GB RAM.=20 Perhaps different SoHo boards would provide different behaviour... Cheers Tom --=-x730y7oFoCNvm0j+hSsR Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (FreeBSD) iEYEABECAAYFAkjzR5gACgkQlcRvFfyds/d+vgCdEV/umXhAfEs3Z5maaZ1F5vkN 7LYAoKevNwsq9aqQmWkFGKWJXNfd1711 =SSWV -----END PGP SIGNATURE----- --=-x730y7oFoCNvm0j+hSsR--
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