linux-kernel - Re: x86_64 ten times slower than i386

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Message-ID: <472F516C.6020702@zytor.com>
Date:	Mon, 05 Nov 2007 09:22:52 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Bo Brantén <bosse@....umu.se>
CC:	linux-kernel@...r.kernel.org
Subject: Re: x86_64 ten times slower than i386

Bo Brantén wrote:
> 
>> On Sat, 3 Nov 2007, Matt Mackall wrote:
>>
>>> This is typically due to a problem with the setup of your MTRRs. Try
> 
> This is the output from cat /proc/mtrr
> 
> 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= 256MB: write-back, count=1
> reg03: base=0xcf800000 (3320MB), size=   8MB: uncachable, count=1
> reg04: base=0xcf700000 (3319MB), size=   1MB: uncachable, count=1

Confusing!  Your maximum would be 3072+256M = 3328M, except that because 
of the uncachable MTRRs (presumably stolen memory for video), the 
maximum is 3319M.

	-hpa
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