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ManDay
Apprentice
Joined: 22 Jan 2008
Posts: 247
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 Posted: Fri Nov 18, 2011 8:38 am Post subject: How to reserve memory for crashkernel? |
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I tried with the default 64M@16M because of what I've gathered from one of the various how-to's, but that disagrees with my kernel:
| Code: | ] Linux version 3.1.0 (root@slate) (gcc version 4.5.3 (Gentoo 4.5.3-r1 p1.0, pie-0.4.5) ) #3 SMP Thu Nov 17 14:17:30 CET 2011
] Command line: auto BOOT_IMAGE=Default ro root=801 rootfstype=ext3 i915.lvds_use_ssc=0 crashkernel=64M@16M
] BIOS-provided physical RAM map:
] BIOS-e820: 0000000000000000 - 000000000009bc00 (usable)
] BIOS-e820: 000000000009bc00 - 00000000000a0000 (reserved)
] BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
] BIOS-e820: 0000000000100000 - 00000000dad9f000 (usable)
] BIOS-e820: 00000000dad9f000 - 00000000dae26000 (ACPI NVS)
] BIOS-e820: 00000000dae26000 - 00000000dae37000 (reserved)
] BIOS-e820: 00000000dae37000 - 00000000dae4d000 (ACPI NVS)
] BIOS-e820: 00000000dae4d000 - 00000000dae77000 (reserved)
] BIOS-e820: 00000000dae77000 - 00000000dae88000 (ACPI NVS)
] BIOS-e820: 00000000dae88000 - 00000000dae8b000 (reserved)
] BIOS-e820: 00000000dae8b000 - 00000000dae8c000 (ACPI NVS)
] BIOS-e820: 00000000dae8c000 - 00000000daea3000 (reserved)
] BIOS-e820: 00000000daea3000 - 00000000daea5000 (ACPI NVS)
] BIOS-e820: 00000000daea5000 - 00000000daea8000 (reserved)
] BIOS-e820: 00000000daea8000 - 00000000daeab000 (ACPI data)
] BIOS-e820: 00000000daeab000 - 00000000daeb0000 (reserved)
] BIOS-e820: 00000000daeb0000 - 00000000daebf000 (ACPI NVS)
] BIOS-e820: 00000000daebf000 - 00000000daf1b000 (reserved)
] BIOS-e820: 00000000daf1b000 - 00000000db800000 (ACPI NVS)
] BIOS-e820: 00000000db800000 - 00000000dc000000 (reserved)
] BIOS-e820: 00000000dde00000 - 00000000e0000000 (reserved)
] BIOS-e820: 00000000f8000000 - 00000000fc000000 (reserved)
] BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved)
] BIOS-e820: 00000000fed10000 - 00000000fed14000 (reserved)
] BIOS-e820: 00000000fed18000 - 00000000fed1a000 (reserved)
] BIOS-e820: 00000000fed1c000 - 00000000fed20000 (reserved)
] BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
] BIOS-e820: 00000000ffa00000 - 00000000ffc00000 (reserved)
] BIOS-e820: 00000000ffe00000 - 0000000100000000 (reserved)
] BIOS-e820: 0000000100000000 - 0000000118000000 (usable)
] NX (Execute Disable) protection: active
] DMI 2.6 present.
] DMI: ASUSTeK Computer Inc. EP121/EP121, BIOS 501 01/26/2011
] e820 update range: 0000000000000000 - 0000000000010000 (usable) ==> (reserved)
] e820 remove range: 00000000000a0000 - 0000000000100000 (usable)
] No AGP bridge found
] last_pfn = 0x118000 max_arch_pfn = 0x400000000
] MTRR default type: uncachable
] MTRR fixed ranges enabled:
] 00000-9FFFF write-back
] A0000-BFFFF uncachable
] C0000-CFFFF write-protect
] D0000-DFFFF uncachable
] E0000-FFFFF write-protect
] MTRR variable ranges enabled:
] 0 base 000000000 mask F80000000 write-back
] 1 base 080000000 mask FC0000000 write-back
] 2 base 0C0000000 mask FE0000000 write-back
] 3 base 0DC000000 mask FFC000000 uncachable
] 4 base 100000000 mask FE0000000 write-back
] 5 base 118000000 mask FF8000000 uncachable
] 6 disabled
] 7 disabled
] x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
] e820 update range: 00000000dc000000 - 0000000100000000 (usable) ==> (reserved)
] last_pfn = 0xdad9f max_arch_pfn = 0x400000000
] initial memory mapped : 0 - 20000000
] Base memory trampoline at [ffff880000096000] 96000 size 20480
] init_memory_mapping: 0000000000000000-00000000dad9f000
] 0000000000 - 00dac00000 page 2M
] 00dac00000 - 00dad9f000 page 4k
] kernel direct mapping tables up to dad9f000 @ 1fffa000-20000000
] init_memory_mapping: 0000000100000000-0000000118000000
] 0100000000 - 0118000000 page 2M
] kernel direct mapping tables up to 118000000 @ dad99000-dad9f000
] crashkernel reservation failed - memory is in use. |
In lack of any documentation on where to reserve memory I'm clueless now. I don't want to try out random values, might do more harm than good.
Can you perhaps explain why it is that this fails for me and where I should reserve the memory instead - or how to find that out.
Thank you |
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Aquous
l33t
Joined: 08 Jan 2011
Posts: 700
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| Posted: Fri Nov 18, 2011 3:54 pm Post subject: |
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You can simply say
and the kernel will figure out where that 64M should be located. |
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ManDay
Apprentice
Joined: 22 Jan 2008
Posts: 247
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| Posted: Fri Nov 18, 2011 6:08 pm Post subject: |
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Ah, good. I will try that, thank you.
Does anyone know what means that this memory is in use? In use by what? Why? And how can I calculate for myself which memory will be used and which wont? |
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ManDay
Apprentice
Joined: 22 Jan 2008
Posts: 247
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| Posted: Fri Nov 18, 2011 9:08 pm Post subject: |
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That succeeded. However, the memory is now reserved at 832MB !! What in the world does that mean? Why so incredibly high? My kernel can't possibly require 832 MB!
Edit: Is it perhaps because of the i915 reserving memory? |
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