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SubjectRe: Kernel problem with memory > 512M

On Wed, 16 Jun 1999, Corin Hartland-Swann wrote:

> I have a Dual PII-350 on a Gigabyte GA-6BXDS motherboard, which has been
> running happily with 512M RAM. I recently upped the memory from 4 x 128M
> DIMM's to 4 x 256M DIMM's. I have been experiencing horrific performance
> problems when using more than 512M of this memory. OS is Mandrake Linux
> v5.3, which is virtually identical to Red Hat v5.3.

i suspect your problem might be a BIOS bug not setting the MTRR's
correctly for the base memory - i've seen that happen once. Take a look at
your /proc/mtrr output:

[root@moon mingo]# cat /proc/mtrr
reg00: base=0x00000000 ( 0MB), size= 512MB: write-back, count=1

if you see the above output then the settings are wrong, just do this to
fix it up for 1G physical RAM:

echo "base=0x00000000 size=0x40000000 type=write-back" > /proc/mtrr

i hope this helps,

-- mingo



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