linux-kernel - Re: MTRR initialization

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Message-ID: <46F46603.8040208@symas.com>
Date:	Fri, 21 Sep 2007 17:46:59 -0700
From:	Howard Chu <hyc@...as.com>
To:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
CC:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: MTRR initialization

Siddha, Suresh B wrote:
> On Fri, Sep 14, 2007 at 09:33:30AM -0700, Howard Chu wrote:
>> So now I have this, which is pretty much
>> what
>> I wanted:
>>
>> reg00: base=0x00000000 (   0MB), size=2048MB: write-back, count=1
>> reg01: base=0x80000000 (2048MB), size=1024MB: write-back, count=1
>> reg02: base=0x100000000 (4096MB), size=1024MB: write-back, count=1
>> reg03: base=0xc0000000 (3072MB), size=1024MB: uncachable, count=1
>> reg04: base=0xc0000000 (3072MB), size= 256MB: write-combining, count=1
>> reg05: base=0xd0000000 (3328MB), size= 256MB: write-combining, count=1
> 
> BTW, having overlapping WC, UC regions make the end result UC. So in this
> case, you may not be getting the desired performance.

Thanks, I noticed that later. I simply deleted the UC mapping since it was no 
longer needed.
-- 
   -- Howard Chu
   Chief Architect, Symas Corp.  http://www.symas.com
   Director, Highland Sun        http://highlandsun.com/hyc/
   Chief Architect, OpenLDAP     http://www.openldap.org/project/
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