Re: 2.6.27 mtrr fixes do not work when X starts

From: Helge Hafting
Date: Mon Aug 25 2008 - 07:10:37 EST

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Yinghai Lu wrote:

On Fri, Aug 22, 2008 at 3:11 AM, Helge Hafting

[old bug report removed]

please boot with "mtrr_spare_reg_nr=3 debug"

I did that, and got:
dmesg:
Command line: root=/dev/sda2 ro mtrr_spare_reg=3 debug
KERNEL supported cpus:
Intel GenuineIntel
AMD AuthenticAMD
Centaur CentaurHauls
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 000000000009f000 (usable)
BIOS-e820: 000000000009f000 - 00000000000a0000 (reserved)
BIOS-e820: 0000000000100000 - 000000007fe80400 (usable)
BIOS-e820: 000000007fe80400 - 0000000080000000 (reserved)
BIOS-e820: 00000000f4000000 - 00000000f8000000 (reserved)
BIOS-e820: 00000000fec00000 - 00000000fec10000 (reserved)
BIOS-e820: 00000000fed18000 - 00000000fed1c000 (reserved)
BIOS-e820: 00000000fed20000 - 00000000fed90000 (reserved)
BIOS-e820: 00000000feda0000 - 00000000feda6000 (reserved)
BIOS-e820: 00000000fee00000 - 00000000fee10000 (reserved)
BIOS-e820: 00000000ffe00000 - 0000000100000000 (reserved)
last_pfn = 0x7fe80 max_arch_pfn = 0x3ffffffff
x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
total RAM coverred: 2047M
gran_size: 1M chunk_size: 1M num_reg: 8 lose RAM: 7M
gran_size: 1M chunk_size: 2M num_reg: 8 lose RAM: 7M
gran_size: 1M chunk_size: 4M num_reg: 8 lose RAM: 7M
gran_size: 1M chunk_size: 8M num_reg: 8 lose RAM: 7M
*BAD* gran_size: 1M chunk_size: 16M num_reg: 8 lose RAM: -1M
gran_size: 1M chunk_size: 32M num_reg: 8 lose RAM: 0M
gran_size: 1M chunk_size: 64M num_reg: 7 lose RAM: 0M
gran_size: 1M chunk_size: 128M num_reg: 6 lose RAM: 0M
gran_size: 1M chunk_size: 256M num_reg: 5 lose RAM: 0M
gran_size: 1M chunk_size: 512M num_reg: 4 lose RAM: 0M
gran_size: 1M chunk_size: 1024M num_reg: 3 lose RAM: 0M
gran_size: 1M chunk_size: 2048M num_reg: 2 lose RAM: 0M
gran_size: 1M chunk_size: 4096M num_reg: 8 lose RAM: 7M
gran_size: 2M chunk_size: 2M num_reg: 8 lose RAM: 7M
gran_size: 2M chunk_size: 4M num_reg: 8 lose RAM: 7M
gran_size: 2M chunk_size: 8M num_reg: 8 lose RAM: 7M
*BAD* gran_size: 2M chunk_size: 16M num_reg: 8 lose RAM: -1M
gran_size: 2M chunk_size: 32M num_reg: 8 lose RAM: 1M
gran_size: 2M chunk_size: 64M num_reg: 7 lose RAM: 1M
gran_size: 2M chunk_size: 128M num_reg: 6 lose RAM: 1M
gran_size: 2M chunk_size: 256M num_reg: 5 lose RAM: 1M
gran_size: 2M chunk_size: 512M num_reg: 4 lose RAM: 1M
gran_size: 2M chunk_size: 1024M num_reg: 3 lose RAM: 1M
gran_size: 2M chunk_size: 2048M num_reg: 2 lose RAM: 1M
gran_size: 2M chunk_size: 4096M num_reg: 8 lose RAM: 7M
gran_size: 4M chunk_size: 4M num_reg: 8 lose RAM: 7M
gran_size: 4M chunk_size: 8M num_reg: 8 lose RAM: 7M
*BAD* gran_size: 4M chunk_size: 16M num_reg: 8 lose RAM: -1M
gran_size: 4M chunk_size: 32M num_reg: 8 lose RAM: 3M
gran_size: 4M chunk_size: 64M num_reg: 7 lose RAM: 3M
gran_size: 4M chunk_size: 128M num_reg: 6 lose RAM: 3M
gran_size: 4M chunk_size: 256M num_reg: 5 lose RAM: 3M
gran_size: 4M chunk_size: 512M num_reg: 4 lose RAM: 3M
gran_size: 4M chunk_size: 1024M num_reg: 3 lose RAM: 3M
gran_size: 4M chunk_size: 2048M num_reg: 2 lose RAM: 3M
gran_size: 4M chunk_size: 4096M num_reg: 8 lose RAM: 7M
gran_size: 8M chunk_size: 8M num_reg: 8 lose RAM: 7M
gran_size: 8M chunk_size: 16M num_reg: 8 lose RAM: 7M
gran_size: 8M chunk_size: 32M num_reg: 8 lose RAM: 7M
gran_size: 8M chunk_size: 64M num_reg: 7 lose RAM: 7M
gran_size: 8M chunk_size: 128M num_reg: 6 lose RAM: 7M
gran_size: 8M chunk_size: 256M num_reg: 5 lose RAM: 7M
gran_size: 8M chunk_size: 512M num_reg: 4 lose RAM: 7M
gran_size: 8M chunk_size: 1024M num_reg: 3 lose RAM: 7M
gran_size: 8M chunk_size: 2048M num_reg: 2 lose RAM: 7M
gran_size: 8M chunk_size: 4096M num_reg: 8 lose RAM: 7M
gran_size: 16M chunk_size: 16M num_reg: 7 lose RAM: 15M
gran_size: 16M chunk_size: 32M num_reg: 7 lose RAM: 15M
gran_size: 16M chunk_size: 64M num_reg: 7 lose RAM: 15M
gran_size: 16M chunk_size: 128M num_reg: 6 lose RAM: 15M
gran_size: 16M chunk_size: 256M num_reg: 5 lose RAM: 15M
gran_size: 16M chunk_size: 512M num_reg: 4 lose RAM: 15M
gran_size: 16M chunk_size: 1024M num_reg: 3 lose RAM: 15M
gran_size: 16M chunk_size: 2048M num_reg: 2 lose RAM: 15M
gran_size: 16M chunk_size: 4096M num_reg: 7 lose RAM: 15M
gran_size: 32M chunk_size: 32M num_reg: 6 lose RAM: 31M
gran_size: 32M chunk_size: 64M num_reg: 6 lose RAM: 31M
gran_size: 32M chunk_size: 128M num_reg: 6 lose RAM: 31M
gran_size: 32M chunk_size: 256M num_reg: 5 lose RAM: 31M
gran_size: 32M chunk_size: 512M num_reg: 4 lose RAM: 31M
gran_size: 32M chunk_size: 1024M num_reg: 3 lose RAM: 31M
gran_size: 32M chunk_size: 2048M num_reg: 2 lose RAM: 31M
gran_size: 32M chunk_size: 4096M num_reg: 6 lose RAM: 31M
gran_size: 64M chunk_size: 64M num_reg: 5 lose RAM: 63M
gran_size: 64M chunk_size: 128M num_reg: 5 lose RAM: 63M
gran_size: 64M chunk_size: 256M num_reg: 5 lose RAM: 63M
gran_size: 64M chunk_size: 512M num_reg: 4 lose RAM: 63M
gran_size: 64M chunk_size: 1024M num_reg: 3 lose RAM: 63M
gran_size: 64M chunk_size: 2048M num_reg: 2 lose RAM: 63M
gran_size: 64M chunk_size: 4096M num_reg: 5 lose RAM: 63M
gran_size: 128M chunk_size: 128M num_reg: 4 lose RAM: 127M
gran_size: 128M chunk_size: 256M num_reg: 4 lose RAM: 127M
gran_size: 128M chunk_size: 512M num_reg: 4 lose RAM: 127M
gran_size: 128M chunk_size: 1024M num_reg: 3 lose RAM: 127M
gran_size: 128M chunk_size: 2048M num_reg: 2 lose RAM: 127M
gran_size: 128M chunk_size: 4096M num_reg: 4 lose RAM: 127M
gran_size: 256M chunk_size: 256M num_reg: 3 lose RAM: 255M
gran_size: 256M chunk_size: 512M num_reg: 3 lose RAM: 255M
gran_size: 256M chunk_size: 1024M num_reg: 3 lose RAM: 255M
gran_size: 256M chunk_size: 2048M num_reg: 2 lose RAM: 255M
gran_size: 256M chunk_size: 4096M num_reg: 3 lose RAM: 255M
gran_size: 512M chunk_size: 512M num_reg: 2 lose RAM: 511M
gran_size: 512M chunk_size: 1024M num_reg: 2 lose RAM: 511M
gran_size: 512M chunk_size: 2048M num_reg: 2 lose RAM: 511M
gran_size: 512M chunk_size: 4096M num_reg: 2 lose RAM: 511M
gran_size: 1024M chunk_size: 1024M num_reg: 1 lose RAM: 1023M
gran_size: 1024M chunk_size: 2048M num_reg: 1 lose RAM: 1023M
gran_size: 1024M chunk_size: 4096M num_reg: 1 lose RAM: 1023M
gran_size: 2048M chunk_size: 2048M num_reg: 0 lose RAM: 2047M
gran_size: 2048M chunk_size: 4096M num_reg: 0 lose RAM: 2047M
Found optimal setting for mtrr clean up
gran_size: 1M chunk_size: 64M num_reg: 7 lose RAM: 0M
range0: 0000000000000000 - 000000007c000000
Setting variable MTRR 0, base: 0MB, range: 1024MB, type WB
Setting variable MTRR 1, base: 1024MB, range: 512MB, type WB
Setting variable MTRR 2, base: 1536MB, range: 256MB, type WB
Setting variable MTRR 3, base: 1792MB, range: 128MB, type WB
Setting variable MTRR 4, base: 1920MB, range: 64MB, type WB
range: 000000007c000000 - 0000000080000000
Setting variable MTRR 5, base: 1984MB, range: 64MB, type WB
hole: 000000007ff00000 - 0000000080000000
Setting variable MTRR 6, base: 2047MB, range: 1MB, type UC
x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
After WB checking
MTRR MAP PFN: 0000000000000000 - 0000000000080000
After UC checking
MTRR MAP PFN: 0000000000000000 - 000000000007ff00
After sorting
MTRR MAP PFN: 0000000000000000 - 000000000007ff00
init_memory_mapping
0000000000 - 007fe00000 page 2M
007fe00000 - 007fe80000 page 4k
kernel direct mapping tables up to 7fe80000 @ 8000-c000
last_map_addr: 7fe80000 end: 7fe80000
DMI 2.4 present.

Xorg.0.log:
(II) Loading sub module "int10"
(II) LoadModule: "int10"
(II) Reloading /usr/lib/xorg/modules//libint10.so
(II) VESA(0): initializing int10
(II) VESA(0): Primary V_BIOS segment is: 0xc000
(II) VESA(0): VESA BIOS detected
(II) VESA(0): VESA VBE Version 3.0
(II) VESA(0): VESA VBE Total Mem: 14336 kB
(II) VESA(0): VESA VBE OEM: NVIDIA
(II) VESA(0): VESA VBE OEM Software Rev: 96.134
(II) VESA(0): VESA VBE OEM Vendor: NVIDIA Corporation
(II) VESA(0): VESA VBE OEM Product: G86 Board - dawson0
(II) VESA(0): VESA VBE OEM Product Rev: Chip Rev (II) VESA(0): Splitting WC range: base: 0xfb000000, size: 0xe00000
(II) VESA(0): Splitting WC range: base: 0xfb800000, size: 0x600000
(==) VESA(0): Write-combining range (0xfbc00000,0x200000)
(WW) VESA(0): Failed to set up write-combining range (0xfb800000,0x600000)
(WW) VESA(0): Failed to set up write-combining range (0xfb000000,0xe00000)
(II) VESA(0): virtual address = 0x7f3ccaf43000,
physical address = 0xfb000000, size = 14680064

Just like last time, this lack of mtrr is reflected in dmesg:
mtrr: no more MTRRs available
mtrr: no more MTRRs available

$ cat /proc/mtrr
reg00: base=0x00000000 ( 0MB), size=1024MB: write-back, count=1
reg01: base=0x40000000 (1024MB), size= 512MB: write-back, count=1
reg02: base=0x60000000 (1536MB), size= 256MB: write-back, count=1
reg03: base=0x70000000 (1792MB), size= 128MB: write-back, count=1
reg04: base=0x78000000 (1920MB), size= 64MB: write-back, count=1
reg05: base=0x7c000000 (1984MB), size= 64MB: write-back, count=1
reg06: base=0x7ff00000 (2047MB), size= 1MB: uncachable, count=1
reg07: base=0xfbc00000 (4028MB), size= 2MB: write-combining, count=1

The problem is still there, I hope the output is useful.
I can test experimental patches if necessary.

Helge Hafting
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Next message: WANG Cong: "[Patch] Trivial: fix "*er then" typos and more"
Previous message: WANG Cong: "Re: [Patch] Trivial: fix "*er then" typos"
Next in thread: Yinghai Lu: "Re: 2.6.27 mtrr fixes do not work when X starts"
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