On Sat, Oct 11, 2008 at 04:45:29PM +0200, Gary Jennejohn wrote: > On Sat, 11 Oct 2008 03:13:16 -0700 > Jeremy Chadwick <[EMAIL PROTECTED]> wrote: > > > On Sat, Oct 11, 2008 at 11:30:57AM +0200, Gary Jennejohn wrote: > > > On Fri, 10 Oct 2008 14:29:37 -0300 > > > JoaoBR <[EMAIL PROTECTED]> 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 | _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[EMAIL PROTECTED]"
