linux-kernel - Re: 2.6.27-rc1 mtrr fixes do not work

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Message-ID: <86802c440808071326m21cff146s3fb5e6118a58a2ca@mail.gmail.com>
Date:	Thu, 7 Aug 2008 13:26:30 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Alexander Huemer" <alexander.huemer@....ac.at>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Andi Kleen" <andi@...stfloor.org>
Subject: Re: 2.6.27-rc1 mtrr fixes do not work

On Thu, Aug 7, 2008 at 1:23 PM, Yinghai Lu <yhlu.kernel@...il.com> wrote:
> On Thu, Aug 7, 2008 at 1:15 PM, Pallipadi, Venkatesh
> <venkatesh.pallipadi@...el.com> wrote:
>>
>> Adding Yinghai.
>>
>>>-----Original Message-----
>>>From: Rafael J. Wysocki [mailto:rjw@...k.pl]
>>>Sent: Thursday, August 07, 2008 1:14 PM
>>>To: Alexander Huemer
>>>Cc: linux-kernel@...r.kernel.org; Andi Kleen; Pallipadi, Venkatesh
>>>Subject: Re: 2.6.27-rc1 mtrr fixes do not work
>>>
>>>[Adding CCs.]
>>>
>>>On Wednesday, 6 of August 2008, Alexander Huemer wrote:
>>>> hi,
>>>>
>>>> mtrr is wrong on my machine. the fixes of 2.6.27-rc1 do not
>>>seem to work.
>>>> bios is the newest version, mainboard vendor says it's not
>>>their fault.
>>>> mainboard is tyan i5000pw.
>>>> please tell me how i can help and cc me on answers, i am not
>>>subscribed.
>>>>
>>>> seaburg ~ # cat /proc/mtrr
>>>> reg00: base=0x00000000 (   0MB), size=198656MB: write-back, count=1
>>>> reg01: base=0x80000000 (2048MB), size=197632MB: write-back, count=1
>>>> reg02: base=0x100000000 (4096MB), size=197632MB: write-back, count=1
>
>>>>
>>>> seaburg ~ # zcat /proc/config.gz | grep MTRR
>>>> CONFIG_MTRR=y
>>>> CONFIG_MTRR_SANITIZER=y
>>>> CONFIG_MTRR_SANITIZER_ENABLE_DEFAULT=1
>>>> CONFIG_MTRR_SANITIZER_SPARE_REG_NR_DEFAULT=1
>>>> seaburg ~ # uname -a
>>>> Linux seaburg 2.6.27-rc1-blackbit #3 SMP Wed Aug 6 00:34:51 CEST 2008
>>>> x86_64 Intel(R) Xeon(R) CPU E5420 @ 2.50GHz GenuineIntel GNU/Linux
>>>> seaburg ~ #
>
> alexander,
>
> please send out
> dmesg -s 262144 > dmesg.txt
> or
> dmesg -s 524288 > dmesg.txt
>
> you may need to set
> CONFIG_LOG_BUF_SHIFT=19

without mtrr_gran_size=64m mtrr_chunk_size=1024m on command line

guess mtrr_chunk_size=512m could work

YH
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