Re: lost memory on a 4GB amd64
From: Andi Kleen (ak_at_muc.de)
Date: 10/23/04
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Date: 23 Oct 2004 18:43:52 +0200 Date: Sat, 23 Oct 2004 18:43:52 +0200 To: Andreas Klein <Andreas.C.Klein@physik.uni-wuerzburg.de>
[cc'ed to discuss@x86-64.org for future reference. If you find
this message in google and you have the same problem, talk
to your BIOS vendor, not to your Linux vendor]
On Sat, Oct 23, 2004 at 12:02:10PM +0200, Andreas Klein wrote:
> - Tyan S2885 pre-production model with a 1.01 pre-release bios
> 6 mb ram (4x512mb, 4x1gb)
> The machine is running SuSE Linux Enterprise Server 8 (32bit).
> We use this machine as our primary mail-server without problems for over a
> year.
>
> - Now we ordered 45 Tyan S2885 and 4 S2875S board.
> Both board do not run stable with more than 2GB ram usable.
> 4GB will only be recognized if the MTRR setting is set to Continuous and
> the Adjust Memory setting is set to Auto.
> If the bios is configured this way and two 1gb ram modules are installed
> for each CPU on the 2885, the machine will not even load and unpack a
> SLES 9 kernel. Memtest sees 0-2GB mem usable and 4-6GB unusable (complains
> about each memory address).
> If all four modules are installed for CPU0, then memtest seems to work
> without problems (0-2GB, 4-6GB), but SLES9 will crash during boot-up.
> If all four modules are installed for CPU1, then memtest seems to work
> without problems too. SLES 9 will run a few minutes before a crash.
> I will try to install SLES 8 (32bit) on the new boxes to see if it runs
> stable. If yes, there is something broken in the 2.6 kernels for amd64, if
> not, the pre-production bios is better that the final ones.
It all sounds very much like a BIOS problem. I doubt 2.4 will
run stable on this setup - if memtest86 doesn't like the memory, Linux
won't like it neither. All I can recommend is to talk to Tyan or
live with the lost memory.
-Andi
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