Re: [PATCH 1/2] x86: mtrr cleanup for converting continuous to discretelayout v7

From: Gabriel C
Date: Tue Apr 29 2008 - 20:07:36 EST

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In reply to: Gabriel C: "Re: [PATCH 1/2] x86: mtrr cleanup for converting continuous to discretelayout v7"
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Gabriel C wrote:
> Yinghai Lu wrote:
>> On Tue, Apr 29, 2008 at 1:25 PM, Gabriel C <nix.or.die@xxxxxxxxxxxxxx> wrote:
>>> Yinghai Lu wrote:
>>> > On Tue, Apr 29, 2008 at 4:51 AM, Gabriel C <nix.or.die@xxxxxxxxxxxxxx> wrote:
>>> >> Yinghai Lu wrote:
>>> >> > On Tue, Apr 29, 2008 at 3:30 AM, Yinghai Lu <yhlu.kernel@xxxxxxxxx> wrote:
>>> >> >> On Tue, Apr 29, 2008 at 2:47 AM, Gabriel C <nix.or.die@xxxxxxxxxxxxxx> 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
>>>
>>> Now I have 2 warnings
>>>
>>>
>>> > mtrr_chunk_size=512m mtrr_gran_size=128m
>>>
>>> ...
>>>
>>> [ 0.000000] Command line: root=/dev/sdb1 ro debug vga=0x317 mtrr_chunk_size=512m mtrr_gran_size=128m 3
>>>
>>>
>>> [ 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 - 00000000c8000000
>>> [ 0.000000] Setting variable MTRR 2, base: 3072MB, range: 128MB, type WB
>>>
>>> [ 0.000000] rangeX: 00000000d0000000 - 00000000d0000000
>>> [ 0.000000] range0: 0000000100000000 - 0000000120000000
>>> [ 0.000000] Setting variable MTRR 3, base: 4096MB, range: 512MB, type WB
>>> [ 0.000000] range: 0000000120000000 - 0000000128000000
>>> [ 0.000000] Setting variable MTRR 4, base: 4608MB, range: 128MB, type WB
>>>
>>> [ 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 - 00000000000c8000
>>> [ 0.000000] MTRR MAP PFN: 0000000000100000 - 0000000000128000
>>>
>>> [ 0.000000] After UC checking
>>> [ 0.000000] MTRR MAP PFN: 0000000000000000 - 00000000000c8000
>>> [ 0.000000] MTRR MAP PFN: 0000000000100000 - 0000000000128000
>>> [ 0.000000] After sorting
>>> [ 0.000000] MTRR MAP PFN: 0000000000000000 - 00000000000c8000
>>> [ 0.000000] MTRR MAP PFN: 0000000000100000 - 0000000000128000
>>> [ 0.000000] WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 64MB of RAM.
>>> [ 0.000000] ------------[ cut here ]------------
>>> [ 0.000000] WARNING: at arch/x86/kernel/cpu/mtrr/main.c:1206 mtrr_trim_uncached_memory+0x25b/0x35a()
>>>
>>> [ 0.000000] Modules linked in:
>>> [ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.25-06058-ga01e035-dirty #805
>>> [ 0.000000]
>>> [ 0.000000] Call Trace:
>>> [ 0.000000] [<ffffffff8022d661>] warn_on_slowpath+0x51/0x78
>>> [ 0.000000] [<ffffffff8067f0dc>] x86_get_mtrr_mem_range+0x241/0x25c
>>> [ 0.000000] [<ffffffff8067d93e>] update_memory_range+0x95/0xb7
>>> [ 0.000000] [<ffffffff8067fa51>] mtrr_trim_uncached_memory+0x25b/0x35a
>>>
>>> [ 0.000000] [<ffffffff8067ca43>] setup_arch+0x280/0x4a2
>>> [ 0.000000] [<ffffffff80676aa6>] start_kernel+0x6e/0x308
>>> [ 0.000000] [<ffffffff80676432>] x86_64_start_kernel+0x241/0x24a
>>> [ 0.000000]
>>> [ 0.000000] ---[ end trace ca143223eefdc828 ]---
>>> [ 0.000000] update e820 for mtrr -- end_pfn
>>> [ 0.000000] modified physical RAM map:
>>> [ 0.000000] modified: 0000000000000000 - 000000000009cc00 (usable)
>>> [ 0.000000] modified: 000000000009cc00 - 00000000000a0000 (reserved)
>>> [ 0.000000] modified: 00000000000e4000 - 0000000000100000 (reserved)
>>> [ 0.000000] modified: 0000000000100000 - 00000000cf550000 (usable)
>>> [ 0.000000] modified: 00000000cf550000 - 00000000cf55e000 (ACPI data)
>>> [ 0.000000] modified: 00000000cf55e000 - 00000000cf5e0000 (ACPI NVS)
>>> [ 0.000000] modified: 00000000cf5e0000 - 00000000cf600000 (reserved)
>>> [ 0.000000] modified: 00000000fee00000 - 00000000fee01000 (reserved)
>>> [ 0.000000] modified: 00000000ffc00000 - 0000000100000000 (reserved)
>>> [ 0.000000] modified: 0000000100000000 - 0000000128000000 (usable)
>>> [ 0.000000] modified: 0000000128000000 - 000000012c000000 (reserved)
>>>
>>> [ 0.000000] WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 757MB of RAM.
>>>
>>> [ 0.000000] ------------[ cut here ]------------
>>> [ 0.000000] WARNING: at arch/x86/kernel/cpu/mtrr/main.c:1227 mtrr_trim_uncached_memory+0x30c/0x35a()
>>> [ 0.000000] Modules linked in:
>>> [ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.25-06058-ga01e035-dirty #805
>>> [ 0.000000]
>>> [ 0.000000] Call Trace:
>>> [ 0.000000] [<ffffffff8022d661>] warn_on_slowpath+0x51/0x78
>>> [ 0.000000] [<ffffffff8067f0dc>] x86_get_mtrr_mem_range+0x241/0x25c
>>> [ 0.000000] [<ffffffff8067d93e>] update_memory_range+0x95/0xb7
>>> [ 0.000000] [<ffffffff8067fb02>] mtrr_trim_uncached_memory+0x30c/0x35a
>>> [ 0.000000] [<ffffffff8067ca43>] setup_arch+0x280/0x4a2
>>> [ 0.000000] [<ffffffff80676aa6>] start_kernel+0x6e/0x308
>>> [ 0.000000] [<ffffffff80676432>] x86_64_start_kernel+0x241/0x24a
>>> [ 0.000000]
>>> [ 0.000000] ---[ end trace ca143223eefdc828 ]---
>>> [ 0.000000] update e820 for mtrr -- holes
>>> [ 0.000000] modified physical RAM map:
>>> [ 0.000000] modified: 0000000000000000 - 000000000009cc00 (usable)
>>> [ 0.000000] modified: 000000000009cc00 - 00000000000a0000 (reserved)
>>> [ 0.000000] modified: 00000000000e4000 - 0000000000100000 (reserved)
>>> [ 0.000000] modified: 0000000000100000 - 00000000c8000000 (usable)
>>> [ 0.000000] modified: 00000000c8000000 - 00000000cf550000 (reserved)
>>> [ 0.000000] modified: 00000000cf550000 - 00000000cf55e000 (ACPI data)
>>> [ 0.000000] modified: 00000000cf55e000 - 00000000cf5e0000 (ACPI NVS)
>>> [ 0.000000] modified: 00000000cf5e0000 - 00000000cf600000 (reserved)
>>> [ 0.000000] modified: 00000000fee00000 - 00000000fee01000 (reserved)
>>> [ 0.000000] modified: 00000000ffc00000 - 000000012c000000 (reserved)
>>>
>>> [ 0.000000] Entering add_active_range(0, 0, 156) 3 entries of 256 used
>>> [ 0.000000] Entering add_active_range(0, 256, 819200) 3 entries of 256 used
>> please try attached trim_holes_fix.patch..., it will fix the trim hole problem.
>
> Tested but warning is still there. I try to boot with mtrr_chunk_size / mtrr_gran_size and see what I get.
>
> ...
>
> [ 0.000000] Linux version 2.6.25-06589-gc65a350-dirty (crazy@thor) (gcc version 4.3.0 (Frugalware Linux) ) #808 SMP PREEMPT Wed Apr 30 01:37:38 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.
> [ 0.000000] ------------[ cut here ]------------
> [ 0.000000] WARNING: at arch/x86/kernel/cpu/mtrr/main.c:1227 mtrr_trim_uncached_memory+0x313/0x361()
> [ 0.000000] Modules linked in:
> [ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.25-06589-gc65a350-dirty #808
> [ 0.000000]
> [ 0.000000] Call Trace:
> [ 0.000000] [<ffffffff8022d699>] warn_on_slowpath+0x51/0x8c
> [ 0.000000] [<ffffffff806810b4>] x86_get_mtrr_mem_range+0x241/0x25c
> [ 0.000000] [<ffffffff8067f915>] update_memory_range+0x95/0xb7
> [ 0.000000] [<ffffffff80681ae1>] mtrr_trim_uncached_memory+0x313/0x361
> [ 0.000000] [<ffffffff8067ea16>] setup_arch+0x280/0x4a6
> [ 0.000000] [<ffffffff80678a3d>] start_kernel+0x6e/0x30d
> [ 0.000000] [<ffffffff80678432>] x86_64_start_kernel+0x241/0x24a
> [ 0.000000]
> [ 0.000000] ---[ end trace 4eaa2a86a8e2da22 ]---
> [ 0.000000] update e820 for mtrr -- holes
> [ 0.000000] modified physical RAM map:
> [ 0.000000] modified: 0000000000000000 - 000000000009cc00 (usable)
> [ 0.000000] modified: 000000000009cc00 - 00000000000a0000 (reserved)
> [ 0.000000] modified: 00000000000e4000 - 0000000000100000 (reserved)
> [ 0.000000] modified: 0000000000100000 - 00000000cc000000 (usable)
> [ 0.000000] modified: 00000000cc000000 - 00000000cf550000 (reserved)
> [ 0.000000] modified: 00000000cf550000 - 00000000cf55e000 (ACPI data)
> [ 0.000000] modified: 00000000cf55e000 - 00000000cf5e0000 (ACPI NVS)
> [ 0.000000] modified: 00000000cf5e0000 - 00000000cf600000 (reserved)
> [ 0.000000] modified: 00000000fee00000 - 00000000fee01000 (reserved)
> [ 0.000000] modified: 00000000ffc00000 - 000000012c000000 (reserved)
> [ 0.000000] Entering add_active_range(0, 0, 156) 3 entries of 256 used
> [ 0.000000] Entering add_active_range(0, 256, 835584) 3 entries of 256 used
> [ 0.000000] max_pfn_mapped = 1228800
> [ 0.000000] init_memory_mapping
>
> ...
>

with mtrr_chunk_size=256m mtrr_gran_size=128m I'm getting :

...

[ 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 - 00000000c8000000
[ 0.000000] Setting variable MTRR 2, base: 3072MB, range: 128MB, type WB
[ 0.000000] rangeX: 00000000d0000000 - 00000000d0000000
[ 0.000000] range0: 0000000100000000 - 0000000120000000
[ 0.000000] Setting variable MTRR 3, base: 4096MB, range: 512MB, type WB
[ 0.000000] range: 0000000120000000 - 0000000128000000
[ 0.000000] Setting variable MTRR 4, base: 4608MB, range: 128MB, type WB
[ 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 - 00000000000c8000
[ 0.000000] MTRR MAP PFN: 0000000000100000 - 0000000000128000
[ 0.000000] After UC checking
[ 0.000000] MTRR MAP PFN: 0000000000000000 - 00000000000c8000
[ 0.000000] MTRR MAP PFN: 0000000000100000 - 0000000000128000
[ 0.000000] After sorting
[ 0.000000] MTRR MAP PFN: 0000000000000000 - 00000000000c8000
[ 0.000000] MTRR MAP PFN: 0000000000100000 - 0000000000128000
[ 0.000000] WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 64MB of RAM.
[ 0.000000] ------------[ cut here ]------------
[ 0.000000] WARNING: at arch/x86/kernel/cpu/mtrr/main.c:1206 mtrr_trim_uncached_memory+0x25b/0x361()
[ 0.000000] Modules linked in:
[ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.25-06589-gc65a350-dirty #808
[ 0.000000]
[ 0.000000] Call Trace:
[ 0.000000] [<ffffffff8022d699>] warn_on_slowpath+0x51/0x8c
[ 0.000000] [<ffffffff806810b4>] x86_get_mtrr_mem_range+0x241/0x25c
[ 0.000000] [<ffffffff8067f915>] update_memory_range+0x95/0xb7
[ 0.000000] [<ffffffff80681a29>] mtrr_trim_uncached_memory+0x25b/0x361
[ 0.000000] [<ffffffff8067ea16>] setup_arch+0x280/0x4a6
[ 0.000000] [<ffffffff80678a3d>] start_kernel+0x6e/0x30d
[ 0.000000] [<ffffffff80678432>] x86_64_start_kernel+0x241/0x24a
[ 0.000000]
[ 0.000000] ---[ end trace 4eaa2a86a8e2da22 ]---
[ 0.000000] update e820 for mtrr -- end_pfn
[ 0.000000] modified physical RAM map:
[ 0.000000] modified: 0000000000000000 - 000000000009cc00 (usable)
[ 0.000000] modified: 000000000009cc00 - 00000000000a0000 (reserved)
[ 0.000000] modified: 00000000000e4000 - 0000000000100000 (reserved)
[ 0.000000] modified: 0000000000100000 - 00000000cf550000 (usable)
[ 0.000000] modified: 00000000cf550000 - 00000000cf55e000 (ACPI data)
[ 0.000000] modified: 00000000cf55e000 - 00000000cf5e0000 (ACPI NVS)
[ 0.000000] modified: 00000000cf5e0000 - 00000000cf600000 (reserved)
[ 0.000000] modified: 00000000fee00000 - 00000000fee01000 (reserved)
[ 0.000000] modified: 00000000ffc00000 - 0000000100000000 (reserved)
[ 0.000000] modified: 0000000100000000 - 0000000128000000 (usable)
[ 0.000000] modified: 0000000128000000 - 000000012c000000 (reserved)
[ 0.000000] WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 757MB of RAM.
[ 0.000000] ------------[ cut here ]------------
[ 0.000000] WARNING: at arch/x86/kernel/cpu/mtrr/main.c:1227 mtrr_trim_uncached_memory+0x313/0x361()
[ 0.000000] Modules linked in:
[ 0.000000] Pid: 0, comm: swapper Tainted: G W 2.6.25-06589-gc65a350-dirty #808
[ 0.000000]
[ 0.000000] Call Trace:
[ 0.000000] [<ffffffff8022d699>] warn_on_slowpath+0x51/0x8c
[ 0.000000] [<ffffffff806810b4>] x86_get_mtrr_mem_range+0x241/0x25c
[ 0.000000] [<ffffffff8067f915>] update_memory_range+0x95/0xb7
[ 0.000000] [<ffffffff80681ae1>] mtrr_trim_uncached_memory+0x313/0x361
[ 0.000000] [<ffffffff8067ea16>] setup_arch+0x280/0x4a6
[ 0.000000] [<ffffffff80678a3d>] start_kernel+0x6e/0x30d
[ 0.000000] [<ffffffff80678432>] x86_64_start_kernel+0x241/0x24a
[ 0.000000]
[ 0.000000] ---[ end trace 4eaa2a86a8e2da22 ]---
[ 0.000000] update e820 for mtrr -- holes
[ 0.000000] modified physical RAM map:
[ 0.000000] modified: 0000000000000000 - 000000000009cc00 (usable)
[ 0.000000] modified: 000000000009cc00 - 00000000000a0000 (reserved)
[ 0.000000] modified: 00000000000e4000 - 0000000000100000 (reserved)
[ 0.000000] modified: 0000000000100000 - 00000000c8000000 (usable)
[ 0.000000] modified: 00000000c8000000 - 00000000cf550000 (reserved)
[ 0.000000] modified: 00000000cf550000 - 00000000cf55e000 (ACPI data)
[ 0.000000] modified: 00000000cf55e000 - 00000000cf5e0000 (ACPI NVS)
[ 0.000000] modified: 00000000cf5e0000 - 00000000cf600000 (reserved)
[ 0.000000] modified: 00000000fee00000 - 00000000fee01000 (reserved)
[ 0.000000] modified: 00000000ffc00000 - 000000012c000000 (reserved)
[ 0.000000] Entering add_active_range(0, 0, 156) 3 entries of 256 used
[ 0.000000] Entering add_active_range(0, 256, 819200) 3 entries of 256 used
[ 0.000000] max_pfn_mapped = 1228800
[ 0.000000] init_memory_mapping

...

Gabriel
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