845GE Chipset severe performance problems

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As there is this thread about mtrr on Intel chipsets, I have some messages in the log about mtrr, and I don't know whether they are harmless warnings or errors that should be reported.

My computer is a 2.4 GhZ Pentium IV with an intel i845G/GL chipset. Motherboard and bios by shuttle.

$ cat /proc/mtrr
reg00: base=0x00000000 (   0MB), size= 512MB: write-back, count=1
reg01: base=0x1f800000 ( 504MB), size=   8MB: uncachable, count=1
reg02: base=0xe0000000 (3584MB), size= 128MB: write-combining, count=2

I have 512 MB of memory, the motherboard doesn't support more than 2GB and I don't see what is this range over 3.5 GB. Also, the two first overlaping ranges look suspicious.

I have the following error/warning messages in the log:

* with kernel 2.4.21pre3 (+ acpi patches)

        mtrr: base(0xe0020000) is not aligned on a size(0x800000)

boundary
(this happens just after initializing drm)

* with kernel 2.5.63 (+ acpi patches)
mtrr: MTRR 2 not used
(this happens once or twice during each sutdown. Note that I don't have drm with kernel 2.5.x, so I don't know if the first message is really
gone)

So... Is this situation normal ?

Éric Brunet

overlapping is allowed. Does this board have onboard graphics ? It looks like your top 8MB is shared video memory. (Ie, the graphics chip doesn't have its own RAM). Usually theres things in the BIOS to adjust the amount of RAM to allocate to the 'card' including a disable option if you have a real card inserted instead.

Could be. If the answer to the above question is yes, then its normal. What exactly are you finding slow ?

Dave