Re: FC3 max memory

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On Wed, 2 Mar 2005, James Wilkinson wrote:

Alexander Lazarevich wrote:
[root@blah root]# uname -a
Linux blah 2.6.10-1.741_FC3smp #1 SMP Thu Jan 13 16:58:29 EST 2005 x86_64
x86_64 x86_64 GNU/Linux

Hardware is Tyan 2885 mobo, two opteron 244 procs in it. Right now the
system has 4GB of memory installed:

[root@hofmann license]# cat /proc/meminfo
MemTotal:      3607440 kB

The mobo takes up to 16GB of memory. But when I add more memory, 4 more
1GB dimms, 8GB total, same exact type of memory that is already in the
system (DDR ECC Reg PC2700), the kernel panics and doesn't boot. The error
is:

<0> kernel panic - not syncing: Attempted to kill the idle task

It dies just before the audit init takes place, so the kernel hardly boots
at all, if even.

Any idea what the maximum memory is for FC3 with the kernel I have? I
tried looking for a bigmem kernel but isn't large memory support built in?
I'm pretty sure support is for much more memory than 4GB. Do I have to
recompile a special kernel though?

Does anyone have more than 4GB of memory in a FC3 system and NOT have
kernel panics? What is your kernel?

AFAIK the x86-64 limit at the moment is 1 TB = 1024 GB. And that should be there for all kernels.

Excellent, thanks.

Something is very wrong there. And I suspect hardware. What does
memtest86 say? Can you try a bootable CD? Can you just try the new
memory?

The memory works just fine in another opteron system I have. That system also runs FC3, same kernel, and it see's 8GB no problem. Same hardware too, except the mobo is the tyan 2882S, which is very similar.


I think it's something in the system, some app. To troublshoot, I'm putting in a new drive, installing fresh to it, and will install apps one by one to see when the problem comes back. If the kernel panic is there from the start of the fresh install, then I've got real problems, as that would make no sense at all...

Alex


James.

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