linux-kernel - Re: 3.10-rc4: mtrr_cleanup: can not find optimal value, please specify mtrr_gran_size/mtrr_chunk

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Date:	Mon, 10 Jun 2013 17:41:47 +0200
From:	Matt <jackdachef@...il.com>
To:	Sergey Meirovich <rathamahata@...il.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>, yinghai@...nel.org
Subject: Re: 3.10-rc4: mtrr_cleanup: can not find optimal value, please
 specify mtrr_gran_size/mtrr_chunk_size

Hi Sergey,

Hi List, Hi Yinghai Lu,


the following patches

http://marc.info/?l=linux-kernel&m=137080807327118&w=2
http://marc.info/?l=linux-kernel&m=137080805927115&w=2

"fixed" it for me and it works again

meanwhile I also tried out 3.9.5 & 3.8.13 and I got the same "BAD"
result on 3.9.5 whereas with 3.8.13 it worked fine


result of 3.10-rc5 + patches:

[    0.000000] MTRR default type: uncachable
[    0.000000] MTRR fixed ranges enabled:
[    0.000000]   00000-9FFFF write-back
[    0.000000]   A0000-BFFFF uncachable
[    0.000000]   C0000-D3FFF write-protect
[    0.000000]   D4000-DFFFF uncachable
[    0.000000]   E0000-E3FFF write-protect
[    0.000000]   E4000-E7FFF write-through
[    0.000000]   E8000-EBFFF write-protect
[    0.000000]   EC000-EFFFF write-through
[    0.000000]   F0000-FFFFF write-protect
[    0.000000] MTRR variable ranges enabled:
[    0.000000]   0 base 000000000 mask E00000000 write-back
[    0.000000]   1 base 200000000 mask FC0000000 write-back
[    0.000000]   2 base 0C0000000 mask FC0000000 uncachable
[    0.000000]   3 disabled
[    0.000000]   4 disabled
[    0.000000]   5 disabled
[    0.000000]   6 disabled
[    0.000000]   7 disabled
[    0.000000] x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
[    0.000000] original variable MTRRs
[    0.000000] reg 0, base: 0GB, range: 8GB, type WB
[    0.000000] reg 1, base: 8GB, range: 1GB, type WB
[    0.000000] reg 2, base: 3GB, range: 1GB, type UC
[    0.000000] total RAM covered: 8192M
[    0.000000] Found optimal setting for mtrr clean up
[    0.000000]  gran_size: 64K chunk_size: 64K num_reg: 4   lose cover RAM: 0G
[    0.000000] New variable MTRRs
[    0.000000] reg 0, base: 0GB, range: 2GB, type WB
[    0.000000] reg 1, base: 2GB, range: 1GB, type WB
[    0.000000] reg 2, base: 4GB, range: 4GB, type WB
[    0.000000] reg 3, base: 8GB, range: 1GB, type WB

cat /proc/mtrr
reg00: base=0x000000000 (    0MB), size= 2048MB, count=1: write-back
reg01: base=0x080000000 ( 2048MB), size= 1024MB, count=1: write-back
reg02: base=0x100000000 ( 4096MB), size= 4096MB, count=1: write-back
reg03: base=0x200000000 ( 8192MB), size= 1024MB, count=1: write-back
reg04: base=0x0d0000000 ( 3328MB), size=  256MB, count=1: write-combining

which is the same like on 3.8.13


Thanks !

Matt

On Mon, Jun 10, 2013 at 12:01 PM, Sergey Meirovich
<rathamahata@...il.com> wrote:
> Hi,
>
> On 5 June 2013 02:08, Matt <jackdachef@...il.com> wrote:
>> Hi everyone,
>>
>>
>> I noticed today the following error messages in /var/log/kern.log :
>>
>>
>> Jun  5 00:26:48 localhost kernel: [    0.000000] MTRR default type: uncachable
>> Jun  5 00:26:48 localhost kernel: [    0.000000] MTRR fixed ranges enabled:
>> Jun  5 00:26:48 localhost kernel: [    0.000000]   00000-9FFFF write-back
>> Jun  5 00:26:48 localhost kernel: [    0.000000]   A0000-BFFFF uncachable
>> Jun  5 00:26:48 localhost kernel: [    0.000000]   C0000-D3FFF write-protect
>> Jun  5 00:26:48 localhost kernel: [    0.000000]   D4000-DFFFF uncachable
>> Jun  5 00:26:48 localhost kernel: [    0.000000]   E0000-E3FFF write-protect
>> Jun  5 00:26:48 localhost kernel: [    0.000000]   E4000-E7FFF write-through
>> Jun  5 00:26:48 localhost kernel: [    0.000000]   E8000-EBFFF write-protect
>> Jun  5 00:26:48 localhost kernel: [    0.000000]   EC000-EFFFF write-through
>> Jun  5 00:26:48 localhost kernel: [    0.000000]   F0000-FFFFF write-protect
>> Jun  5 00:26:48 localhost kernel: [    0.000000] MTRR variable ranges enabled:
>> Jun  5 00:26:48 localhost kernel: [    0.000000]   0 base 000000000
>> mask E00000000 write-back
>> Jun  5 00:26:48 localhost kernel: [    0.000000]   1 base 200000000
>> mask FC0000000 write-back
>> Jun  5 00:26:48 localhost kernel: [    0.000000]   2 base 0C0000000
>> mask FC0000000 uncachable
>> Jun  5 00:26:48 localhost kernel: [    0.000000]   3 disabled
>> Jun  5 00:26:48 localhost kernel: [    0.000000]   4 disabled
>> Jun  5 00:26:48 localhost kernel: [    0.000000]   5 disabled
>> Jun  5 00:26:48 localhost kernel: [    0.000000]   6 disabled
>> Jun  5 00:26:48 localhost kernel: [    0.000000]   7 disabled
>> Jun  5 00:26:48 localhost kernel: [    0.000000] x86 PAT enabled: cpu
>> 0, old 0x7040600070406, new 0x7010600070106
>> Jun  5 00:26:48 localhost kernel: [    0.000000] original variable MTRRs
>> Jun  5 00:26:48 localhost kernel: [    0.000000] reg 0, base: 0GB,
>> range: 8GB, type WB
>> Jun  5 00:26:48 localhost kernel: [    0.000000] reg 1, base: 8GB,
>> range: 1GB, type WB
>> Jun  5 00:26:48 localhost kernel: [    0.000000] reg 2, base: 3GB,
>> range: 1GB, type UC
>> Jun  5 00:26:48 localhost kernel: [    0.000000] total RAM covered: 8192M
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 64K num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 128K num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 256K num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 512K num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 1M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 2M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 4M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 8M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 16M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 32M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 64M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 128K num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 256K num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 512K num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 1M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 2M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 4M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 8M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 16M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 32M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 64M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 256K num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 512K num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 1M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 2M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 4M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 8M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 16M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 32M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 64M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 512K num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 1M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 2M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 4M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 8M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 16M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 32M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 64M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 1M
>> chunk_size: 1M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 1M
>> chunk_size: 2M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 1M
>> chunk_size: 4M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 1M
>> chunk_size: 8M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 1M
>> chunk_size: 16M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 1M
>> chunk_size: 32M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 1M
>> chunk_size: 64M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 1M
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 1M
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 1M
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 1M
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 1M
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 2M
>> chunk_size: 2M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 2M
>> chunk_size: 4M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 2M
>> chunk_size: 8M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 2M
>> chunk_size: 16M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 2M
>> chunk_size: 32M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 2M
>> chunk_size: 64M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 2M
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 2M
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 2M
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 2M
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 2M
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 4M
>> chunk_size: 4M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 4M
>> chunk_size: 8M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 4M
>> chunk_size: 16M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 4M
>> chunk_size: 32M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 4M
>> chunk_size: 64M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 4M
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 4M
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 4M
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 4M
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 4M
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 8M
>> chunk_size: 8M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 8M
>> chunk_size: 16M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 8M
>> chunk_size: 32M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 8M
>> chunk_size: 64M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 8M
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 8M
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 8M
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 8M
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 8M
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 16M
>> chunk_size: 16M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 16M
>> chunk_size: 32M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 16M
>> chunk_size: 64M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 16M
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 16M
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 16M
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 16M
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 16M
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 32M
>> chunk_size: 32M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 32M
>> chunk_size: 64M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 32M
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 32M
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 32M
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 32M
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 32M
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 64M
>> chunk_size: 64M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 64M
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 64M
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 64M
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 64M
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 64M
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 128M
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 128M
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 128M
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 128M
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 128M
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 256M
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 256M
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 256M
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 256M
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 512M
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 512M
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 512M
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 1G
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] *BAD*gran_size: 1G
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:26:48 localhost kernel: [    0.000000]  gran_size: 2G
>> chunk_size: 2G num_reg: 2   lose cover RAM: 2G
>> Jun  5 00:26:48 localhost kernel: [    0.000000] mtrr_cleanup: can not
>> find optimal value
>> Jun  5 00:26:48 localhost kernel: [    0.000000] please specify
>> mtrr_gran_size/mtrr_chunk_size
>>
>>
>>
>> when trying to append some commands, e.g.:
>>
>> enable_mtrr_cleanup mtrr_spare_reg_nr=1 mtrr_gran_size=32M mtrr_chunk_size=128M
>>
>> or
>>
>> enable_mtrr_cleanup mtrr_spare_reg_nr=0
>>
>> it doesn't make any change
>>
>>
>> this would yield the following result:
>>
>>
>> Jun  5 00:20:47 localhost kernel: [    0.000000] MTRR default type: uncachable
>> Jun  5 00:20:47 localhost kernel: [    0.000000] MTRR fixed ranges enabled:
>> Jun  5 00:20:47 localhost kernel: [    0.000000]   00000-9FFFF write-back
>> Jun  5 00:20:47 localhost kernel: [    0.000000]   A0000-BFFFF uncachable
>> Jun  5 00:20:47 localhost kernel: [    0.000000]   C0000-D3FFF write-protect
>> Jun  5 00:20:47 localhost kernel: [    0.000000]   D4000-DFFFF uncachable
>> Jun  5 00:20:47 localhost kernel: [    0.000000]   E0000-E3FFF write-protect
>> Jun  5 00:20:47 localhost kernel: [    0.000000]   E4000-E7FFF write-through
>> Jun  5 00:20:47 localhost kernel: [    0.000000]   E8000-EBFFF write-protect
>> Jun  5 00:20:47 localhost kernel: [    0.000000]   EC000-EFFFF write-through
>> Jun  5 00:20:47 localhost kernel: [    0.000000]   F0000-FFFFF write-protect
>> Jun  5 00:20:47 localhost kernel: [    0.000000] MTRR variable ranges enabled:
>> Jun  5 00:20:47 localhost kernel: [    0.000000]   0 base 000000000
>> mask E00000000 write-back
>> Jun  5 00:20:47 localhost kernel: [    0.000000]   1 base 200000000
>> mask FC0000000 write-back
>> Jun  5 00:20:47 localhost kernel: [    0.000000]   2 base 0C0000000
>> mask FC0000000 uncachable
>> Jun  5 00:20:47 localhost kernel: [    0.000000]   3 disabled
>> Jun  5 00:20:47 localhost kernel: [    0.000000]   4 disabled
>> Jun  5 00:20:47 localhost kernel: [    0.000000]   5 disabled
>> Jun  5 00:20:47 localhost kernel: [    0.000000]   6 disabled
>> Jun  5 00:20:47 localhost kernel: [    0.000000]   7 disabled
>> Jun  5 00:20:47 localhost kernel: [    0.000000] x86 PAT enabled: cpu
>> 0, old 0x7040600070406, new 0x7010600070106
>> Jun  5 00:20:47 localhost kernel: [    0.000000] original variable MTRRs
>> Jun  5 00:20:47 localhost kernel: [    0.000000] reg 0, base: 0GB,
>> range: 8GB, type WB
>> Jun  5 00:20:47 localhost kernel: [    0.000000] reg 1, base: 8GB,
>> range: 1GB, type WB
>> Jun  5 00:20:47 localhost kernel: [    0.000000] reg 2, base: 3GB,
>> range: 1GB, type UC
>> Jun  5 00:20:47 localhost kernel: [    0.000000] total RAM covered: 8192M
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 32M
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] invalid
>> mtrr_gran_size or mtrr_chunk_size, will find optimal one
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 64K num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 128K num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 256K num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 512K num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 1M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 2M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 4M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 8M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 16M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 32M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 64M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 64K
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 128K num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 256K num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 512K num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 1M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 2M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 4M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 8M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 16M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 32M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 64M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 128K
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 256K num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 512K num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 1M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 2M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 4M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 8M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 16M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 32M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 64M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 256K
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 512K num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 1M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 2M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 4M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 8M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 16M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 32M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 64M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 512K
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 1M
>> chunk_size: 1M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 1M
>> chunk_size: 2M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 1M
>> chunk_size: 4M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 1M
>> chunk_size: 8M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 1M
>> chunk_size: 16M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 1M
>> chunk_size: 32M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 1M
>> chunk_size: 64M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 1M
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 1M
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 1M
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 1M
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 1M
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 2M
>> chunk_size: 2M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 2M
>> chunk_size: 4M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 2M
>> chunk_size: 8M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 2M
>> chunk_size: 16M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 2M
>> chunk_size: 32M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 2M
>> chunk_size: 64M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 2M
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 2M
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 2M
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 2M
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 2M
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 4M
>> chunk_size: 4M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 4M
>> chunk_size: 8M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 4M
>> chunk_size: 16M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 4M
>> chunk_size: 32M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 4M
>> chunk_size: 64M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 4M
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 4M
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 4M
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 4M
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 4M
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 8M
>> chunk_size: 8M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 8M
>> chunk_size: 16M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 8M
>> chunk_size: 32M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 8M
>> chunk_size: 64M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 8M
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 8M
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 8M
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 8M
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 8M
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 16M
>> chunk_size: 16M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 16M
>> chunk_size: 32M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 16M
>> chunk_size: 64M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 16M
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 16M
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 16M
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 16M
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 16M
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 32M
>> chunk_size: 32M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 32M
>> chunk_size: 64M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 32M
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 32M
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 32M
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 32M
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 32M
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 64M
>> chunk_size: 64M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 64M
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 64M
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 64M
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 64M
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 64M
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 128M
>> chunk_size: 128M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 128M
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 128M
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 128M
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 128M
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 256M
>> chunk_size: 256M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 256M
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 256M
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 256M
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 512M
>> chunk_size: 512M num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 512M
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 512M
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 1G
>> chunk_size: 1G num_reg: 4   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] *BAD*gran_size: 1G
>> chunk_size: 2G num_reg: 5   lose cover RAM: -0G
>> Jun  5 00:20:47 localhost kernel: [    0.000000]  gran_size: 2G
>> chunk_size: 2G num_reg: 2   lose cover RAM: 2G
>> Jun  5 00:20:47 localhost kernel: [    0.000000] mtrr_cleanup: can not
>> find optimal value
>> Jun  5 00:20:47 localhost kernel: [    0.000000] please specify
>> mtrr_gran_size/mtrr_chunk_size
>>
>>
>>
>>
>>
>> Is this some kind of kernel BUG due to the negative value (- 0G) ?
>>
>> MTRR seems to be a topic that is not widely discussed or thoroughly
>> understood when using google to find answers.
>>
>> cat /proc/mtrr
>> reg00: base=0x000000000 (    0MB), size= 8192MB, count=1: write-back
>> reg01: base=0x200000000 ( 8192MB), size= 1024MB, count=1: write-back
>> reg02: base=0x0c0000000 ( 3072MB), size= 1024MB, count=1: uncachable
>>
>
> I also seems to suffer from the same issue on 3.9.5:
> in my situation it looks even weirder:
> rathamahata@...edriver ~ $ cat /proc/mtrr
> reg00: base=0x000000000 (    0MB), size= 2048MB, count=1: write-back
> reg01: base=0x080000000 ( 2048MB), size=  256MB, count=1: write-back
> reg02: base=0x08f800000 ( 2296MB), size=    8MB, count=1: uncachable
> reg03: base=0x0b0000000 ( 2816MB), size=  256MB, count=1: write-combining
> reg04: base=0x0c0000000 ( 3072MB), size=  256MB, count=1: write-combining
> rathamahata@...edriver ~ $ free -m
>              total       used       free     shared    buffers     cached
> Mem:          7370        745       6624          0         34        241
> -/+ buffers/cache:        470       6900
> Swap:         3659          0       3659
> rathamahata@...edriver ~ $
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