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

From: Yinghai Lu
Date: Wed Apr 30 2008 - 00:26:13 EST


On Tue, Apr 29, 2008 at 9:12 PM, Gabriel C <nix.or.die@xxxxxxxxxxxxxx> 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?

YH
YH
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/