Re: problems with 1gb ddr memory sticks on linux

[Kasper Dupont <kasperd@daimi.au.dk>]

"Bryan K. Walton" wrote:
> 
> I have a box running Debian 3.0 with a Via C3 800mhz processor
> that slows to a crawl when I put in a 1GB stick of PC2100 DDR memory.
> 
> The board, a Gigabyte GA-6RX, supports this memory stick.

Could it be the case, that it really doesn't support that
memory eventhough it claims to?

> My 2.4.18 kernel is compiled with High Memory support and linux and the
> bios see all of the memory.

Did you try without High Memory support?

> However, the box is VERY slow.  It takes
> about 5 minutes to install .deb binary.  It took me 12 hours to compile
> the 2.4.18 kernel!
> 
> Here is what I have done to rule things out . . .
> 
> 1) The box runs FAST with M$ Windows 2000.
> 2) The box runs FAST when using identical kinds of memory but in
> quantities of 512MB or less.

Did you try with a total of 1024MB on two 512MB modules?

> 3) The box runs slow with other linux distos also. (I tried Redhat 7.2)
> 
> It seems to me that the problem has something to do with the linux
> kernel and 1GB memory sticks.  Am I off base?

Try the "slow" memory and use a mem= boot option to tell the
Linux kernel not to use all of it.

> 
> Anyone have any ideas?

I wonder if it could be the case, that it for some reason doesn't
use cache for all the memory.

-- 
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