Yinghai Lu wrote:
quoted text
> On Tue, Apr 29, 2008 at 9:12 PM, Gabriel C <nix.or.die@googlemail.com> wrote:
>> Yinghai Lu wrote:
>>  > please try the patches
>>  >
>>  > from
>>  > http://lkml.org/lkml/2008/4/29/754
>>  > http://lkml.org/lkml/2008/4/29/753
>>  >
>>  > in addtion to
>>  >
>>  > http://people.redhat.com/mingo/x86.git/README
>>  > ( it has v8 already)
>>  >
>>  > and try with mtrr_gran_size=128m
>>
>>  Without any value I get :
>>
>>  ...
>>
>>  [    0.000000] Linux version 2.6.25-x86-latest.git-06598-g6a2c2ff-dirty (crazy@thor) (gcc version 4.3.0 (Frugalware Linux) ) #1 SMP PREEMPT Wed Apr 30 05:51:39 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 - 00000000cf600000
>>
>> [    0.000000] Setting variable MTRR 2, base: 3072MB, range: 128MB, type WB
>>  [    0.000000] Setting variable MTRR 3, base: 3200MB, range: 64MB, type WB
>>  [    0.000000] Setting variable MTRR 4, base: 3264MB, range: 32MB, type WB
>>  [    0.000000] Setting variable MTRR 5, base: 3296MB, range: 16MB, type WB
>>  [    0.000000] Setting variable MTRR 6, base: 3312MB, range: 4MB, type WB
>>  [    0.000000] Setting variable MTRR 7, base: 3316MB, range: 2MB, type WB
>>  [    0.000000] range0: 00000000cf800000 - 00000000df800000
>>  [    0.000000] range: 00000000df800000 - 00000000d0000000
>>
>> [    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 - 00000000000cf600
>>
>> [    0.000000] After UC checking
>>  [    0.000000] MTRR MAP PFN: 0000000000000000 - 00000000000cf600
>>
>> [    0.000000] After sorting
>>  [    0.000000] MTRR MAP PFN: 0000000000000000 - 00000000000cf600
>>  [    0.000000] WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 704MB of RAM.
>>
>> [    0.000000] update e820 for mtrr
>>
>> [    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 - 000000012c000000 (reserved)
>>  [    0.000000] Entering add_active_range(0, 0, 156) 3 entries of 256 used
>>  [    0.000000] Entering add_active_range(0, 256, 849232) 3 entries of 256 used
>>
>> [    0.000000] max_pfn_mapped = 1228800
>>  [    0.000000] init_memory_mapping
>>
>>  ...
>>
>>  [   20.984343] [drm] Initialized i915 1.6.0 20060119 on minor 0
>>  [   21.450368] mtrr: no more MTRRs available
>>
>>  ...
>>
>>  with mtrr_gran_size=128m I get :
>>
>>  ...
>>
>>  [    0.000000] Linux version 2.6.25-x86-latest.git-06598-g6a2c2ff-dirty (crazy@thor) (gcc version 4.3.0 (Frugalware Linux) ) #1 SMP PREEMPT Wed Apr 30 05:51:39 CEST 2008
>>  [    0.000000] Command line: root=/dev/sdb1 ro debug vga=0x317 mtrr_gran_size=128m
>>
>>
>> [    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 181MB of RAM.
>>
>> [    0.000000] update e820 for mtrr
>>
>> [    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 - 0000000100000000 (reserved)
>>  [    0.000000]  modified: 0000000100000000 - 0000000128000000 (usable)
>>  [    0.000000]  modified: 0000000128000000 - 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] Entering add_active_range(0, 1048576, 1212416) 3 entries of 256 used
>>
>> [    0.000000] max_pfn_mapped = 1228800
>>  [    0.000000] init_memory_mapping
>>
>>  ...
>>
>>  I will try tomorrow some more boot options but now I need some sleep ;)
> 
> thanks.  let's try different mtrr_chunk_size/mtrr_gran_size to get
> back more ram.
> under mtrr_gran_size=128m, does the your X server work well..., fast or slow?

Yes X is fine and fast , it is even fine ( slower from my felling ) when I lose the 704MB.
In general with x86-latest.git tree things seems faster on that box , maybe there are some other bug fixes too.

I've tested some mtrr_chunk_size/mtrr_gran_size combos, dmesg's are uploaded there :

http://frugalware.org/~crazy/dmesg/mtrr/

Also setting lower values on mtrr_gran_size seems to give more RAM back , 
mtrr_chunk_size 256/512 eats 704 MB and 128 doesn't seems to do something ?

Other things I noticed ( probably you could add a note about in kernel-parameter.txt or some doc file ):

Setting mtrr_gran_size to high , on my box >=512m hangs the box on boot , 
setting it to low , on my box <=8m , will cause X to die with such a message :

xf86MapVidMem: Could not mmap framebuffer (0xd0000000,0x10000000) (Invalid argument)

If you want I can test such values for mtrr_chunk_size too , just let me know.

To be honest I'm even fine when losing 700 - 800 MB as long X and everything else does work. 
The other alternative for me for that problem without your patches will be to buy new ram ( 2 x 1G ) 
and then I lose near 2,3G compared to now or live with broken X until xorg-server will support and 
*work fine* with PAT ( most probably not that soon ).

Gabriel 
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