FAQ
After fresh installation of CentOS 6.2 on my server, I get following errors
in my dmesg output:

-------

MTRR default type: uncachable
MTRR fixed ranges enabled:
00000-9FFFF write-back
A0000-BFFFF uncachable
C0000-D7FFF write-protect
D8000-E7FFF uncachable
E8000-FFFFF write-protect
MTRR variable ranges enabled:
0 base 000000000 mask C00000000 write-back
1 base 400000000 mask FC0000000 write-back
2 base 0CB800000 mask FFF800000 uncachable
3 base 0CC000000 mask FFC000000 uncachable
4 base 0D0000000 mask FF0000000 uncachable
5 base 0E0000000 mask FE0000000 uncachable
6 base 42FE00000 mask FFFE00000 uncachable
7 base 430000000 mask FF0000000 uncachable
8 disabled
9 disabled
x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
original variable MTRRs
reg 0, base: 0GB, range: 16GB, type WB
reg 1, base: 16GB, range: 1GB, type WB
reg 2, base: 3256MB, range: 8MB, type UC
reg 3, base: 3264MB, range: 64MB, type UC
reg 4, base: 3328MB, range: 256MB, type UC
reg 5, base: 3584MB, range: 512MB, type UC
reg 6, base: 17150MB, range: 2MB, type UC
reg 7, base: 17152MB, range: 256MB, type UC
total RAM covered: 16310M
gran_size: 64K chunk_size: 64K num_reg: 10 lose cover
RAM: 126M
gran_size: 64K chunk_size: 128K num_reg: 10 lose cover
RAM: 126M
gran_size: 64K chunk_size: 256K num_reg: 10 lose cover
RAM: 126M
gran_size: 64K chunk_size: 512K num_reg: 10 lose cover
RAM: 126M
gran_size: 64K chunk_size: 1M num_reg: 10 lose cover RAM: 126M
gran_size: 64K chunk_size: 2M num_reg: 10 lose cover RAM: 126M
*BAD*gran_size: 64K chunk_size: 4M num_reg: 10 lose cover RAM: -2M
*BAD*gran_size: 64K chunk_size: 8M num_reg: 10 lose cover RAM: -2M
gran_size: 64K chunk_size: 16M num_reg: 10 lose cover
RAM: 0G
gran_size: 64K chunk_size: 32M num_reg: 10 lose cover
RAM: 0G
gran_size: 64K chunk_size: 64M num_reg: 10 lose cover
RAM: 0G
gran_size: 64K chunk_size: 128M num_reg: 10 lose cover
RAM: 0G
gran_size: 64K chunk_size: 256M num_reg: 10 lose cover
RAM: 0G
*BAD*gran_size: 64K chunk_size: 512M num_reg: 10 lose cover
RAM: -256M
gran_size: 64K chunk_size: 1G num_reg: 10 lose cover RAM: 0G
*BAD*gran_size: 64K chunk_size: 2G num_reg: 10 lose cover RAM: -1G
gran_size: 128K chunk_size: 128K num_reg: 10 lose cover
RAM: 126M
gran_size: 128K chunk_size: 256K num_reg: 10 lose cover
RAM: 126M
gran_size: 128K chunk_size: 512K num_reg: 10 lose cover
RAM: 126M
gran_size: 128K chunk_size: 1M num_reg: 10 lose cover RAM: 126M
gran_size: 128K chunk_size: 2M num_reg: 10 lose cover RAM: 126M
*BAD*gran_size: 128K chunk_size: 4M num_reg: 10 lose cover RAM: -2M
*BAD*gran_size: 128K chunk_size: 8M num_reg: 10 lose cover RAM: -2M
gran_size: 128K chunk_size: 16M num_reg: 10 lose cover
RAM: 0G
gran_size: 128K chunk_size: 32M num_reg: 10 lose cover
RAM: 0G
gran_size: 128K chunk_size: 64M num_reg: 10 lose cover
RAM: 0G
gran_size: 128K chunk_size: 128M num_reg: 10 lose cover
RAM: 0G
gran_size: 128K chunk_size: 256M num_reg: 10 lose cover
RAM: 0G
*BAD*gran_size: 128K chunk_size: 512M num_reg: 10 lose cover
RAM: -256M
gran_size: 128K chunk_size: 1G num_reg: 10 lose cover RAM: 0G
*BAD*gran_size: 128K chunk_size: 2G num_reg: 10 lose cover RAM: -1G
gran_size: 256K chunk_size: 256K num_reg: 10 lose cover
RAM: 126M
gran_size: 256K chunk_size: 512K num_reg: 10 lose cover
RAM: 126M
gran_size: 256K chunk_size: 1M num_reg: 10 lose cover RAM: 126M
gran_size: 256K chunk_size: 2M num_reg: 10 lose cover RAM: 126M
*BAD*gran_size: 256K chunk_size: 4M num_reg: 10 lose cover RAM: -2M
*BAD*gran_size: 256K chunk_size: 8M num_reg: 10 lose cover RAM: -2M
gran_size: 256K chunk_size: 16M num_reg: 10 lose cover
RAM: 0G
gran_size: 256K chunk_size: 32M num_reg: 10 lose cover
RAM: 0G
gran_size: 256K chunk_size: 64M num_reg: 10 lose cover
RAM: 0G
gran_size: 256K chunk_size: 128M num_reg: 10 lose cover
RAM: 0G
gran_size: 256K chunk_size: 256M num_reg: 10 lose cover
RAM: 0G
*BAD*gran_size: 256K chunk_size: 512M num_reg: 10 lose cover
RAM: -256M
gran_size: 256K chunk_size: 1G num_reg: 10 lose cover RAM: 0G
*BAD*gran_size: 256K chunk_size: 2G num_reg: 10 lose cover RAM: -1G
gran_size: 512K chunk_size: 512K num_reg: 10 lose cover
RAM: 126M
gran_size: 512K chunk_size: 1M num_reg: 10 lose cover RAM: 126M
gran_size: 512K chunk_size: 2M num_reg: 10 lose cover RAM: 126M
*BAD*gran_size: 512K chunk_size: 4M num_reg: 10 lose cover RAM: -2M
*BAD*gran_size: 512K chunk_size: 8M num_reg: 10 lose cover RAM: -2M
gran_size: 512K chunk_size: 16M num_reg: 10 lose cover
RAM: 0G
gran_size: 512K chunk_size: 32M num_reg: 10 lose cover
RAM: 0G
gran_size: 512K chunk_size: 64M num_reg: 10 lose cover
RAM: 0G
gran_size: 512K chunk_size: 128M num_reg: 10 lose cover
RAM: 0G
gran_size: 512K chunk_size: 256M num_reg: 10 lose cover
RAM: 0G
*BAD*gran_size: 512K chunk_size: 512M num_reg: 10 lose cover
RAM: -256M
gran_size: 512K chunk_size: 1G num_reg: 10 lose cover RAM: 0G
*BAD*gran_size: 512K chunk_size: 2G num_reg: 10 lose cover RAM: -1G
gran_size: 1M chunk_size: 1M num_reg: 10 lose cover RAM: 126M
gran_size: 1M chunk_size: 2M num_reg: 10 lose cover RAM: 126M
*BAD*gran_size: 1M chunk_size: 4M num_reg: 10 lose cover RAM: -2M
*BAD*gran_size: 1M chunk_size: 8M num_reg: 10 lose cover RAM: -2M
gran_size: 1M chunk_size: 16M num_reg: 10 lose cover RAM: 0G
gran_size: 1M chunk_size: 32M num_reg: 10 lose cover RAM: 0G
gran_size: 1M chunk_size: 64M num_reg: 10 lose cover RAM: 0G
gran_size: 1M chunk_size: 128M num_reg: 10 lose cover RAM: 0G
gran_size: 1M chunk_size: 256M num_reg: 10 lose cover RAM: 0G
*BAD*gran_size: 1M chunk_size: 512M num_reg: 10 lose cover
RAM: -256M
gran_size: 1M chunk_size: 1G num_reg: 10 lose cover RAM: 0G
*BAD*gran_size: 1M chunk_size: 2G num_reg: 10 lose cover RAM: -1G
gran_size: 2M chunk_size: 2M num_reg: 10 lose cover RAM: 126M
*BAD*gran_size: 2M chunk_size: 4M num_reg: 10 lose cover RAM: -2M
*BAD*gran_size: 2M chunk_size: 8M num_reg: 10 lose cover RAM: -2M
gran_size: 2M chunk_size: 16M num_reg: 10 lose cover RAM: 0G
gran_size: 2M chunk_size: 32M num_reg: 10 lose cover RAM: 0G
gran_size: 2M chunk_size: 64M num_reg: 10 lose cover RAM: 0G
gran_size: 2M chunk_size: 128M num_reg: 10 lose cover RAM: 0G
gran_size: 2M chunk_size: 256M num_reg: 10 lose cover RAM: 0G
*BAD*gran_size: 2M chunk_size: 512M num_reg: 10 lose cover
RAM: -256M
gran_size: 2M chunk_size: 1G num_reg: 10 lose cover RAM: 0G
*BAD*gran_size: 2M chunk_size: 2G num_reg: 10 lose cover RAM: -1G
gran_size: 4M chunk_size: 4M num_reg: 10 lose cover RAM: 126M
*BAD*gran_size: 4M chunk_size: 8M num_reg: 10 lose cover RAM: -2M
gran_size: 4M chunk_size: 16M num_reg: 10 lose cover RAM: 2M
gran_size: 4M chunk_size: 32M num_reg: 10 lose cover RAM: 2M
gran_size: 4M chunk_size: 64M num_reg: 10 lose cover RAM: 2M
gran_size: 4M chunk_size: 128M num_reg: 10 lose cover RAM: 2M
gran_size: 4M chunk_size: 256M num_reg: 10 lose cover RAM: 2M
*BAD*gran_size: 4M chunk_size: 512M num_reg: 10 lose cover
RAM: -254M
gran_size: 4M chunk_size: 1G num_reg: 10 lose cover RAM: 2M
*BAD*gran_size: 4M chunk_size: 2G num_reg: 10 lose cover
RAM: -1022M
gran_size: 8M chunk_size: 8M num_reg: 10 lose cover RAM: 126M
gran_size: 8M chunk_size: 16M num_reg: 10 lose cover RAM: 6M
gran_size: 8M chunk_size: 32M num_reg: 10 lose cover RAM: 6M
gran_size: 8M chunk_size: 64M num_reg: 10 lose cover RAM: 6M
gran_size: 8M chunk_size: 128M num_reg: 10 lose cover RAM: 6M
gran_size: 8M chunk_size: 256M num_reg: 10 lose cover RAM: 6M
*BAD*gran_size: 8M chunk_size: 512M num_reg: 10 lose cover
RAM: -250M
gran_size: 8M chunk_size: 1G num_reg: 10 lose cover RAM: 6M
*BAD*gran_size: 8M chunk_size: 2G num_reg: 10 lose cover
RAM: -1018M
gran_size: 16M chunk_size: 16M num_reg: 10 lose cover
RAM: 70M
gran_size: 16M chunk_size: 32M num_reg: 10 lose cover
RAM: 22M
gran_size: 16M chunk_size: 64M num_reg: 10 lose cover
RAM: 22M
gran_size: 16M chunk_size: 128M num_reg: 10 lose cover
RAM: 22M
gran_size: 16M chunk_size: 256M num_reg: 10 lose cover
RAM: 22M
*BAD*gran_size: 16M chunk_size: 512M num_reg: 10 lose cover
RAM: -234M
gran_size: 16M chunk_size: 1G num_reg: 10 lose cover RAM: 22M
*BAD*gran_size: 16M chunk_size: 2G num_reg: 10 lose cover
RAM: -1002M
gran_size: 32M chunk_size: 32M num_reg: 10 lose cover
RAM: 54M
gran_size: 32M chunk_size: 64M num_reg: 10 lose cover
RAM: 54M
gran_size: 32M chunk_size: 128M num_reg: 10 lose cover
RAM: 54M
gran_size: 32M chunk_size: 256M num_reg: 10 lose cover
RAM: 54M
*BAD*gran_size: 32M chunk_size: 512M num_reg: 10 lose cover
RAM: -202M
gran_size: 32M chunk_size: 1G num_reg: 10 lose cover RAM: 54M
*BAD*gran_size: 32M chunk_size: 2G num_reg: 10 lose cover
RAM: -970M
gran_size: 64M chunk_size: 64M num_reg: 8 lose cover
RAM: 118M
gran_size: 64M chunk_size: 128M num_reg: 8 lose cover
RAM: 118M
gran_size: 64M chunk_size: 256M num_reg: 9 lose cover
RAM: 118M
gran_size: 64M chunk_size: 512M num_reg: 10 lose cover
RAM: 118M
gran_size: 64M chunk_size: 1G num_reg: 9 lose cover RAM: 118M
gran_size: 64M chunk_size: 2G num_reg: 10 lose cover RAM: 118M
gran_size: 128M chunk_size: 128M num_reg: 7 lose cover
RAM: 182M
gran_size: 128M chunk_size: 256M num_reg: 9 lose cover
RAM: 182M
gran_size: 128M chunk_size: 512M num_reg: 10 lose cover
RAM: 182M
gran_size: 128M chunk_size: 1G num_reg: 9 lose cover RAM: 182M
gran_size: 128M chunk_size: 2G num_reg: 10 lose cover RAM: 182M
gran_size: 256M chunk_size: 256M num_reg: 5 lose cover
RAM: 438M
gran_size: 256M chunk_size: 512M num_reg: 5 lose cover
RAM: 438M
gran_size: 256M chunk_size: 1G num_reg: 6 lose cover RAM: 438M
gran_size: 256M chunk_size: 2G num_reg: 7 lose cover RAM: 438M
gran_size: 512M chunk_size: 512M num_reg: 5 lose cover
RAM: 438M
gran_size: 512M chunk_size: 1G num_reg: 6 lose cover RAM: 438M
gran_size: 512M chunk_size: 2G num_reg: 7 lose cover RAM: 438M
gran_size: 1G chunk_size: 1G num_reg: 4 lose cover RAM: 950M
gran_size: 1G chunk_size: 2G num_reg: 4 lose cover RAM: 950M
gran_size: 2G chunk_size: 2G num_reg: 3 lose cover RAM: 1974M
mtrr_cleanup: can not find optimal value
please specify mtrr_gran_size/mtrr_chunk_size

--------------

use 16 GB ECC Ram on this server, all modules are the same (speed,
manufacuer - Kingston, etc).

Here are my questions:

1. o you know what disadventages this could make on server installation
2. what should I modify in server configuration to solve this problem?

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