Messages in this thread | | | Date | Wed, 30 Apr 2008 14:04:16 +0200 | From | Gabriel C <> | Subject | Re: [PATCH 1/2] x86: mtrr cleanup for converting continuous to discrete layout v7 |
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Yinghai Lu wrote: > 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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