Re: [BUG?] mtrr sanitizer fails on Latitude E6230

From: Mikael Pettersson
Date: Thu Nov 07 2013 - 03:26:19 EST

Yinghai Lu writes:
> On Wed, Nov 6, 2013 at 1:16 AM, Mikael Pettersson <mikpelinux@xxxxxxxxx> wrote:
> > I recently got a Dell Latitude E6230 (Ivy Bridge i7-3540M) and noticed that
> > the mtrr sanitizer failed on it:
> >
> > === snip ===
> > Linux version 3.12.0 (mikpe@barley) (gcc version 4.8.3 20131017 (prerelease) (GCC) ) #1 SMP Wed Nov 6 09:46:02 CET 2013
> > Command line: ro root=LABEL=/ resume=/dev/sda2 rd_NO_LUKS rd_NO_LVM rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYTABLE=sv-latin1
> ...
> gran_size: 8M chunk_size: 64M num_reg: 9 lose cover RAM: 6M
> ...
> > mtrr_cleanup: can not find optimal value
> > please specify mtrr_gran_size/mtrr_chunk_size
> > === snip ===
> >
> > For now I'm disabling the mtrr sanitizer in this machine's kernel.
> Can you try to boot with "mtrr_gran_size=8m mtrr_chunk_size=64m" ?

That results in:

Linux version 3.12.0-test (mikpe@barley) (gcc version 4.8.3 20131017 (prerelease) (GCC) ) #1 SMP Thu Nov 7 09:12:14 CET 2013
Command line: mtrr_gran_size=8m mtrr_chunk_size=64m ro root=LABEL=/ resume=/dev/sda2 rd_NO_LUKS rd_NO_LVM rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYTABLE=sv-latin1
KERNEL supported cpus:
Intel GenuineIntel
e820: BIOS-provided physical RAM map:
BIOS-e820: [mem 0x0000000000000000-0x000000000009d3ff] usable
BIOS-e820: [mem 0x000000000009d400-0x000000000009ffff] reserved
BIOS-e820: [mem 0x00000000000e0000-0x00000000000fffff] reserved
BIOS-e820: [mem 0x0000000000100000-0x000000001fffffff] usable
BIOS-e820: [mem 0x0000000020000000-0x00000000201fffff] reserved
BIOS-e820: [mem 0x0000000020200000-0x0000000040003fff] usable
BIOS-e820: [mem 0x0000000040004000-0x0000000040004fff] reserved
BIOS-e820: [mem 0x0000000040005000-0x00000000d5f09fff] usable
BIOS-e820: [mem 0x00000000d5f0a000-0x00000000d5ffffff] reserved
BIOS-e820: [mem 0x00000000d6000000-0x00000000d6751fff] usable
BIOS-e820: [mem 0x00000000d6752000-0x00000000d67fffff] reserved
BIOS-e820: [mem 0x00000000d6800000-0x00000000d6fb2fff] usable
BIOS-e820: [mem 0x00000000d6fb3000-0x00000000d6ffffff] ACPI data
BIOS-e820: [mem 0x00000000d7000000-0x00000000d86fbfff] usable
BIOS-e820: [mem 0x00000000d86fc000-0x00000000d87fffff] ACPI NVS
BIOS-e820: [mem 0x00000000d8800000-0x00000000d96d4fff] usable
BIOS-e820: [mem 0x00000000d96d5000-0x00000000da054fff] reserved
BIOS-e820: [mem 0x00000000da055000-0x00000000da097fff] ACPI NVS
BIOS-e820: [mem 0x00000000da098000-0x00000000daadcfff] usable
BIOS-e820: [mem 0x00000000daadd000-0x00000000dafeffff] reserved
BIOS-e820: [mem 0x00000000daff0000-0x00000000daffffff] usable
BIOS-e820: [mem 0x00000000db800000-0x00000000df9fffff] reserved
BIOS-e820: [mem 0x00000000f8000000-0x00000000fbffffff] reserved
BIOS-e820: [mem 0x00000000fec00000-0x00000000fec00fff] reserved
BIOS-e820: [mem 0x00000000fed00000-0x00000000fed03fff] reserved
BIOS-e820: [mem 0x00000000fed1c000-0x00000000fed1ffff] reserved
BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved
BIOS-e820: [mem 0x00000000ff000000-0x00000000ffffffff] reserved
BIOS-e820: [mem 0x0000000100000000-0x000000021e5fffff] usable
NX (Execute Disable) protection: active
SMBIOS 2.7 present.
DMI: Dell Inc. Latitude E6230/0Y47PX, BIOS A11 08/27/2013
e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
e820: remove [mem 0x000a0000-0x000fffff] usable
e820: last_pfn = 0x21e600 max_arch_pfn = 0x400000000
MTRR default type: uncachable
MTRR fixed ranges enabled:
00000-9FFFF write-back
A0000-BFFFF uncachable
C0000-CFFFF write-protect
D0000-E7FFF uncachable
E8000-FFFFF write-protect
MTRR variable ranges enabled:
0 base 000000000 mask E00000000 write-back
1 base 200000000 mask FE0000000 write-back
2 base 0E0000000 mask FE0000000 uncachable
3 base 0DC000000 mask FFC000000 uncachable
4 base 0DB800000 mask FFF800000 uncachable
5 base 21F000000 mask FFF000000 uncachable
6 base 21E800000 mask FFF800000 uncachable
7 base 21E600000 mask FFFE00000 uncachable
8 disabled
9 disabled
x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
original variable MTRRs
reg 0, base: 0GB, range: 8GB, type WB
reg 1, base: 8GB, range: 512MB, type WB
reg 2, base: 3584MB, range: 512MB, type UC
reg 3, base: 3520MB, range: 64MB, type UC
reg 4, base: 3512MB, range: 8MB, type UC
reg 5, base: 8688MB, range: 16MB, type UC
reg 6, base: 8680MB, range: 8MB, type UC
reg 7, base: 8678MB, range: 2MB, type UC
total RAM covered: 8094M
gran_size: 8M chunk_size: 64M num_reg: 9 lose cover RAM: 6M
New variable MTRRs
reg 0, base: 0GB, range: 2GB, type WB
reg 1, base: 2GB, range: 1GB, type WB
reg 2, base: 3GB, range: 256MB, type WB
reg 3, base: 3328MB, range: 128MB, type WB
reg 4, base: 3456MB, range: 64MB, type WB
reg 5, base: 3512MB, range: 8MB, type UC
reg 6, base: 4GB, range: 4GB, type WB
reg 7, base: 8GB, range: 512MB, type WB
reg 8, base: 8672MB, range: 32MB, type UC
e820: update [mem 0xdb800000-0xffffffff] usable ==> reserved
e820: update [mem 0x21e000000-0x21e5fffff] usable ==> reserved
WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 6MB of RAM.
update e820 for mtrr
e820: modified physical RAM map:
modified: [mem 0x0000000000000000-0x0000000000000fff] reserved
modified: [mem 0x0000000000001000-0x000000000009d3ff] usable
modified: [mem 0x000000000009d400-0x000000000009ffff] reserved
modified: [mem 0x00000000000e0000-0x00000000000fffff] reserved
modified: [mem 0x0000000000100000-0x000000001fffffff] usable
modified: [mem 0x0000000020000000-0x00000000201fffff] reserved
modified: [mem 0x0000000020200000-0x0000000040003fff] usable
modified: [mem 0x0000000040004000-0x0000000040004fff] reserved
modified: [mem 0x0000000040005000-0x00000000d5f09fff] usable
modified: [mem 0x00000000d5f0a000-0x00000000d5ffffff] reserved
modified: [mem 0x00000000d6000000-0x00000000d6751fff] usable
modified: [mem 0x00000000d6752000-0x00000000d67fffff] reserved
modified: [mem 0x00000000d6800000-0x00000000d6fb2fff] usable
modified: [mem 0x00000000d6fb3000-0x00000000d6ffffff] ACPI data
modified: [mem 0x00000000d7000000-0x00000000d86fbfff] usable
modified: [mem 0x00000000d86fc000-0x00000000d87fffff] ACPI NVS
modified: [mem 0x00000000d8800000-0x00000000d96d4fff] usable
modified: [mem 0x00000000d96d5000-0x00000000da054fff] reserved
modified: [mem 0x00000000da055000-0x00000000da097fff] ACPI NVS
modified: [mem 0x00000000da098000-0x00000000daadcfff] usable
modified: [mem 0x00000000daadd000-0x00000000dafeffff] reserved
modified: [mem 0x00000000daff0000-0x00000000daffffff] usable
modified: [mem 0x00000000db800000-0x00000000df9fffff] reserved
modified: [mem 0x00000000f8000000-0x00000000fbffffff] reserved
modified: [mem 0x00000000fec00000-0x00000000fec00fff] reserved
modified: [mem 0x00000000fed00000-0x00000000fed03fff] reserved
modified: [mem 0x00000000fed1c000-0x00000000fed1ffff] reserved
modified: [mem 0x00000000fee00000-0x00000000fee00fff] reserved
modified: [mem 0x00000000ff000000-0x00000000ffffffff] reserved
modified: [mem 0x0000000100000000-0x000000021dffffff] usable
modified: [mem 0x000000021e000000-0x000000021e5fffff] reserved

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