Re: Serious Kernel slowdown with HIMEM (4Gig) in 2.6.7

[Mikael Pettersson]

On Mon, 16 Aug 2004 09:23:40 -0400, Lawrence E. Freil wrote:
>Iteresting idea, here is the /proc/mtrr output:
>
>reg00: base=0x00000000 (   0MB), size= 512MB: write-back, count=1
>reg01: base=0x20000000 ( 512MB), size= 256MB: write-back, count=1
>reg02: base=0x30000000 ( 768MB), size= 128MB: write-back, count=1
>reg03: base=0x38000000 ( 896MB), size=  64MB: write-back, count=1
>reg04: base=0x3c000000 ( 960MB), size=  32MB: write-back, count=1
>reg05: base=0x3e000000 ( 992MB), size=  16MB: write-back, count=1
>reg06: base=0xf0000000 (3840MB), size=   2MB: write-combining, count=1
>
>The memory in question is the block from 896 to 1Gig.  Looks pretty
>normal.

How does the E820 memory map look? (At the top of the dmesg log.)

Your BIOS left the [1008MB,1024MB[ range uncached. Try booting
with "mem=1008M". If that fixes the performance problem,
complain to your mainboard vendor that their BIOS is broken.

/Mikael
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