Re: 36 bit MTRRs, Re: test10-pre1 problems on 4-way SuperServer8050

From: Boszormenyi Zoltan (
Date: Thu Oct 12 2000 - 01:13:27 EST

On Wed, 11 Oct 2000, Tigran Aivazian wrote:
> Hi Zoltan,
> I have tried your patch and although it works:
> # cat /proc/mtrr
> reg00: base=0x00000000 ( 0MB), size=4096MB: write-back, count=1
> reg01: base=0x00100000000 ( 4096MB), size= 2048MB: write-back,
> count=1
> reg02: base=0xfc000000 (4032MB), size= 64MB: uncachable, count=1
> unfortunately, it doesn't solve the problem. The machine is still
> unbearably slow (up to 40x slower!) and one of the eepro100 interfaces is
> still not working.

I'm sure that your machine's memory map is NOT
4 GB from 0...0xFFFFFFFF and 2 GB from 0x100000000...0x17FFFFFFF.
More likely the reverse: where are the PCI cards' areas?
Look at the e820 map in the boot log, mark those areas
as write-back and tell me what happens.

Zoltan Boszormenyi

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