Messages in this thread | | | Date | Wed, 16 Jun 1999 11:59:55 +0200 (CEST) | From | Ingo Molnar <> | Subject | Re: Kernel problem with memory > 512M |
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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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