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https://bugzilla.novell.com/show_bug.cgi?id=572369

https://bugzilla.novell.com/show_bug.cgi?id=572369#c19


--- Comment #19 from revealed revealed <revealed@xxxxxxxxxxxx> 2011-10-13 
12:20:32 UTC ---
Hello!

In the meantime i upgraded to SuSE 11.4 64 bit;

I encoutered again the following message in dmesg:
[    2.532049] mtrr: type mismatch for c0000000,10000000 old: write-back new:
write-combining

So i did some research and found a bootparameter called: "enable_mtrr_cleanup"

I will write it down below.


I just dont know if it is correct, to apply it at bootup. Do i mess intended
settings with it, or does it improve something? The only thing from cosmetics
is that i get rid of the error in dmesg if i add the switch?


Greetings,

R

########
Without bootparameter:
cat /proc/mtrr
reg00: base=0x080000000 ( 2048MB), size= 2048MB, count=1: uncachable
reg01: base=0x000000000 (    0MB), size= 4096MB, count=1: write-back
reg02: base=0x100000000 ( 4096MB), size= 2048MB, count=1: write-back

dmesg | grep mtrr
[    2.532049] mtrr: type mismatch for c0000000,10000000 old: write-back new:
write-combining

free -m: Total: 3962
Top: Mem:   4057372k total

########
With: "enable_mtrr_cleanup"
cat /proc/mtrr
reg00: base=0x000000000 (    0MB), size= 2048MB, count=1: write-back
reg01: base=0x100000000 ( 4096MB), size= 2048MB, count=1: write-back
reg02: base=0x0c0000000 ( 3072MB), size=  256MB, count=1: write-combining
dmesg | grep mtrr
[    0.000000] Command line: root=/dev/sdc6 resume=/dev/sdc5 splash=silent
enable_mtrr_cleanup vga=0x31a
[    0.000000] Found optimal setting for mtrr clean up
[    0.000000] Kernel command line: root=/dev/sdc6 resume=/dev/sdc5
splash=silent enable_mtrr_cleanup vga=0x31a

free -m Total: 3962
Top: Mem:   4057372k total

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