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DateTue, 29 Apr 2008 10:11:23 -0700
From"Yinghai Lu" <>
SubjectRe: [PATCH 1/2] x86: mtrr cleanup for converting continuous to discrete layout v7
On Tue, Apr 29, 2008 at 4:51 AM, Gabriel C <nix.or.die@googlemail.com> wrote:
>
> Yinghai Lu wrote:
>  > On Tue, Apr 29, 2008 at 3:30 AM, Yinghai Lu <yhlu.kernel@gmail.com> wrote:
>  >> On Tue, Apr 29, 2008 at 2:47 AM, Gabriel C <nix.or.die@googlemail.com> wrote:
>  >>  > Yinghai Lu wrote:
>  >>  >  > some BIOS like to use continus MTRR layout, and may X driver can not add
>  >>  >  > WB entries for graphical cards when 4g or more RAM installed.
>  >>  >  >
>  >>  >  > the patch will change MTRR to discrete.
>  >>  >  >
>  >>  >  > mtrr_chunk_size= could be used to have smaller continuous block to hold holes.
>  >>  >  > default is 256m, could be set according to size of graphics card memory.
>  >>  >  >
>  >>  >  > v2: fix -1 for UC checking
>  >>  >  > v3: default to disable, and need use enable_mtrr_cleanup to enable this feature
>  >>  >  >     skip the var state change warning.
>  >>  >  >     remove next_basek in range_to_mtrr()
>  >>  >  > v4: correct warning mask.
>  >>  >  > v5: CONFIG_MTRR_SANITIZER
>  >>  >  > v6: fix 1g, 2g, 512 aligment with extra hole
>  >>  >  > v7: gran_sizek to prevent running out of MTRRs.
>  >>  >  >
>  >>  >
>  >>  >  With this version ( and patch http://lkml.org/lkml/2008/4/29/97 ) applyed on latest linus git tree
>  >>  >  the box OOPS'es early.
>  >>  >
>  >>  >  Sorry I don't have time right now to write down the part of the OOPS I can see on monitor , I can try to find
>  >>  >  some time later.
>  >>  >
>  >>  >  In any way OOPS'es on __free_one_page+0x191/0x21e
>  >>
>  >>  thanks. found one problem with hole_basek ...
>  >>
>  >>  will send you v8, and hope it will be last version.
>  >
>  > please try v8, it should get rid of the 8m entry. it need patch
>  > http://lkml.org/lkml/2008/4/29/97 too.
>
>  Box does boot with v8 but now I get that warning you fixed in v2 again =):
>
>  ....
>  [    0.000000] Linux version 2.6.25-06058-ga01e035-dirty (crazy@thor) (gcc version 4.3.0 (Frugalware Linux) ) #805 SMP PREEMPT Tue Apr 29 13:04:49 CEST 2008
>  [    0.000000] Command line: root=/dev/sdb1 ro debug vga=0x317
>  [    0.000000] BIOS-provided physical RAM map:
>  [    0.000000]  BIOS-e820: 0000000000000000 - 000000000009cc00 (usable)
>  [    0.000000]  BIOS-e820: 000000000009cc00 - 00000000000a0000 (reserved)
>  [    0.000000]  BIOS-e820: 00000000000e4000 - 0000000000100000 (reserved)
>  [    0.000000]  BIOS-e820: 0000000000100000 - 00000000cf550000 (usable)
>  [    0.000000]  BIOS-e820: 00000000cf550000 - 00000000cf55e000 (ACPI data)
>  [    0.000000]  BIOS-e820: 00000000cf55e000 - 00000000cf5e0000 (ACPI NVS)
>  [    0.000000]  BIOS-e820: 00000000cf5e0000 - 00000000cf600000 (reserved)
>  [    0.000000]  BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
>  [    0.000000]  BIOS-e820: 00000000ffc00000 - 0000000100000000 (reserved)
>  [    0.000000]  BIOS-e820: 0000000100000000 - 000000012c000000 (usable)
>  [    0.000000] Entering add_active_range(0, 0, 156) 0 entries of 256 used
>  [    0.000000] Entering add_active_range(0, 256, 849232) 1 entries of 256 used
>  [    0.000000] Entering add_active_range(0, 1048576, 1228800) 2 entries of 256 used
>  [    0.000000] max_pfn_mapped = 1228800
>  [    0.000000] x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
>  [    0.000000] After WB checking
>  [    0.000000] MTRR MAP PFN: 0000000000000000 - 000000000012c000
>  [    0.000000] After UC checking
>  [    0.000000] MTRR MAP PFN: 0000000000000000 - 00000000000cf600
>  [    0.000000] MTRR MAP PFN: 0000000000100000 - 000000000012c000
>  [    0.000000] MTRR MAP PFN: 00000000000cf800 - 00000000000d0000
>  [    0.000000] After sorting
>  [    0.000000] MTRR MAP PFN: 0000000000000000 - 00000000000cf600
>  [    0.000000] MTRR MAP PFN: 00000000000cf800 - 00000000000d0000
>  [    0.000000] MTRR MAP PFN: 0000000000100000 - 000000000012c000
>  [    0.000000] range0: 0000000000000000 - 00000000c0000000
>  [    0.000000] Setting variable MTRR 0, base: 0MB, range: 2048MB, type WB
>  [    0.000000] Setting variable MTRR 1, base: 2048MB, range: 1024MB, type WB
>  [    0.000000] range: 00000000c0000000 - 00000000d0000000
>  [    0.000000] Setting variable MTRR 2, base: 3072MB, range: 256MB, type WB
>  [    0.000000] hole: 00000000cc000000 - 00000000d0000000
>  [    0.000000] Setting variable MTRR 3, base: 3264MB, range: 64MB, type UC
>  [    0.000000] rangeX: 00000000d0000000 - 00000000d0000000
>  [    0.000000] range0: 0000000100000000 - 0000000120000000
>  [    0.000000] Setting variable MTRR 4, base: 4096MB, range: 512MB, type WB
>  [    0.000000] range: 0000000120000000 - 0000000130000000
>  [    0.000000] Setting variable MTRR 5, base: 4608MB, range: 256MB, type WB
>  [    0.000000] hole: 000000012c000000 - 0000000130000000
>  [    0.000000] Setting variable MTRR 6, base: 4800MB, range: 64MB, type UC
>  [    0.000000] DONE variable MTRRs
>  [    0.000000] x86 PAT enabled: cpu 0, old 0x7010600070106, new 0x7010600070106
>  [    0.000000] After WB checking
>  [    0.000000] MTRR MAP PFN: 0000000000000000 - 00000000000d0000
>  [    0.000000] MTRR MAP PFN: 0000000000100000 - 0000000000130000
>  [    0.000000] After UC checking
>  [    0.000000] MTRR MAP PFN: 0000000000000000 - 00000000000cc000
>  [    0.000000] MTRR MAP PFN: 0000000000100000 - 000000000012c000
>  [    0.000000] After sorting
>  [    0.000000] MTRR MAP PFN: 0000000000000000 - 00000000000cc000
>  [    0.000000] MTRR MAP PFN: 0000000000100000 - 000000000012c000
>  [    0.000000] WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 757MB of RAM.

so
>  [    0.000000] MTRR MAP PFN: 0000000000000000 - 00000000000cf600
>  [    0.000000] MTRR MAP PFN: 00000000000cf800 - 00000000000d0000
>  [    0.000000] MTRR MAP PFN: 0000000000100000 - 000000000012c000
===>
>  [    0.000000] MTRR MAP PFN: 0000000000000000 - 00000000000cc000
>  [    0.000000] MTRR MAP PFN: 0000000000100000 - 000000000012c000

please try
mtrr_chunk_size=512m mtrr_gran_size=128m
or
mtrr_chunk_size=256m mtrr_gran_size=128m

YH


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