FreeBSD 5.3 problem on Dual AMD64 2.2GHz with 8GB RAM

David O'Brien obrien at
Wed Oct 27 09:55:43 PDT 2004

On Wed, Oct 27, 2004 at 11:12:31AM +0900, Ganbold wrote:
> At 11:45 AM 10/27/2004, you wrote:
> >On Wed, Oct 27, 2004 at 09:52:58AM +0900, Ganbold wrote:
> >> I still have problem running FreeBSD 5.3 with 8GB RAM on Dual amd64
> >> 2.2GHz (IBM @server 325, ServeRAID 6M) with 8GB RAM.
> >> It was working ok with 4 GB RAM. Afterwards I added another 4GB RAM and
> >> tried to boot FreeBSD
> >> with 8GB RAM. However it showed various errors and login didn't work. You
> >> can see serial console messages
> >> at the end of my email.
> >
> >An IBM e325 has only 6 DIMM slots, specifically what RAM configuration
> >are you using?  Do you have ECC turned on?  Are using DRAM scrubbing?
> >What is your BIOS memory interleaving settings?
> I have 2GB x 4 = 8GB RAM and ECC is turned on and I have following settings 
> in BIOS:

By chance, have you tried both with 4GB per CPU and with all 8GB on one
CPU?  Did it make a difference?

> 4GB Memory Hole adjust  -> AUTO

I would turn this off (disable).

> DRAM Bank interleave            -> AUTO
> Node memory interleave  -> Disabled
> ACPI SRAT table         -> Disabled

I would enable the SRAT table, but do keep disabled the Node memory
interleave.  FreeBSD will not use the SRAT table, but with it
ON/Enabled/AUTO I know the CPU will be set up a certain way that we do

> HPET Timer                      -> Enabled
> ECC                             -> Enabled
> DRAM ECC                        -> Enabled
> ECC Scrub Redirection           -> Disabled

I would turn on ECC Scrub Redirection, but thats just to gain reliability.

I would also download the latest memtest86+ ISO image from, burn it to CDROM, and see if all your RAM passes.  I
assume it is IBM [re]branded?

-- David  (obrien at

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