linux-kernel - Re: warning in arch/x86/kernel/cpu/mtrr/generic.c:400 with 2.6.29-rc3 on IBM x3400

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Date:	Wed, 11 Feb 2009 10:52:04 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"Morten P.D. Stevens" <mstevens@...-professional.com>
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: warning in arch/x86/kernel/cpu/mtrr/generic.c:400 with 2.6.29-rc3
 on IBM x3400

Morten P.D. Stevens wrote:
> Hi,
> 
>> so there is some problem with your BIOS, please ask the vendor to
>> provide one to make
>> 2.6.24 happy.
> 
> I'll report the issue to the IBM support.
> 
> on our IBM x3400 servers running RHEL the same output:
> 
> 2.6.18-92.1.10.el5 #
> 
> reg00: base=0xc0000000 (3072MB), size=1024MB: uncachable, count=1
> reg01: base=0x00000000 (   0MB), size=4096MB: write-back, count=1
> reg02: base=0x100000000 (4096MB), size=1024MB: write-back, count=1
> reg03: base=0xbff80000 (3071MB), size=196608MB: uncachable, count=1

so that bios need to be fixed too.

> 
> and in dmesg:
> 
> mtrr: type mismatch for d0000000,1000000 old: uncachable new:
> write-combining
want add one entry for xwindow with your display card.
> 
> 
> Is this a big problem for direct usage? The performance on these servers
> is still fine...?
x window could be some slow.

YH
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