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    SubjectRe: [PATCH 1/2] x86: mtrr cleanup for converting continuous to discrete layout v7
    Gabriel C wrote:
    > Yinghai Lu wrote:
    >> On Tue, Apr 29, 2008 at 1:25 PM, Gabriel C <nix.or.die@googlemail.com> wrote:
    >>> Yinghai Lu wrote:
    >>> > 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
    >>>
    >>> 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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