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SubjectRe: Terrible IO performance when using 4GB of RAM on a 32 bit machine
H. Peter Anvin wrote:
> Peter Rabbitson wrote:
>> I have captured dmesg output without mem[5], with mem=3900M[6] and
>> mem=2048M[7].
>>
>
> What does /proc/mtrr look like in the two cases?
>

Identical for mem=3900 and without it.

reg00: base=0x00000000 ( 0MB), size=2048MB: write-back, count=1

reg01: base=0x80000000 (2048MB), size=1024MB: write-back, count=1

reg02: base=0xc0000000 (3072MB), size= 512MB: write-back, count=1

reg03: base=0xe0000000 (3584MB), size= 256MB: write-back, count=1

reg04: base=0xf0000000 (3840MB), size= 128MB: write-back, count=1

reg05: base=0xf8000000 (3968MB), size= 32MB: write-back, count=1


Peter
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