Re: 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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    • From: Peter Rabbitson <[email protected]>
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    • From: "H. Peter Anvin" <[email protected]>

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