Re: 1GB RAM is missing.
On Sun, Oct 21, 2007 at 03:13:54PM -0700, pgega wrote:
> I tried swaping all of them in any possible order, none of sticks is
> broken.
I had the same kind of problems with my Soltek motherboard, although
32-bit one, so the following might not apply. But I guess it might be
a bios issue anyway, so you can try this.
In my case the kernel sees 4 GB of memory, but if I just let the kernel use
all the memory, all i/o becomes really slow. The 10 minute boot time sounds
familiar. The resolution is to limit the available memory a little.
finpasojan3:/proc# cat /proc/mtrr
reg00: base=0x00000000 ( 0MB), size=2048MB: write-back, count=1
reg01: base=0x80000000 (2048MB), size=1024MB: write-back, count=1
reg02: base=0xc0000000 (3072MB), size= 512MB: write-back, count=1
reg03: base=0xe0000000 (3584MB), size= 256MB: write-back, count=1
reg04: base=0xf0000000 (3840MB), size= 32MB: write-back, count=1
reg05: base=0xf2000000 (3872MB), size= 16MB: write-back, count=1
reg06: base=0xf5800000 (3928MB), size= 8MB: write-combining, count=2
reg07: base=0xf5000000 (3920MB), size= 8MB: write-combining, count=1
In my case it seems that the usable limit is somewhere between 3800 MB
and 3900 MB. So I set grub to limit the memory with kernel
mem-parameter. I have this in my /boot/grub/menu.lst
title Debian GNU/Linux, kernel 2.6.18-4-686
root (hd0,0)
kernel /boot/vmlinuz-2.6.18-4-686 root=/dev/hda1 ro mem=3840M
initrd /boot/initrd.img-2.6.18-4-686
Even if this is not the case, you can experiment with the mem-parameter
and find out the maximum usable amount of memory without taking out
the ram sticks.
Pasi
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