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I'm getting following kernel messages:
[ 0.001512] mtrr_cleanup: can not find optimal value
[ 0.001513] please specify mtrr_gran_size/mtrr_chunk_sizeSearching trough the internet I found following:
Both are suggesting to set MTRR parameters via kernel options, but neither of those explain how to choose the optimal values.
I also had hard time finding the answer trough google.
Given my dmesg output (see below), I have 80 options to choose from...
So:
Besides the amount of lost RAM, what other implecations different mtrr_gran_size/mtrr_chunk_size combinations have?
What is num_reg and how is select appropritae value for that?
My dmesg output about MTRR:
[ 0.000585] MTRR default type: uncachable
[ 0.000587] MTRR fixed ranges enabled:
[ 0.000588] 00000-9FFFF write-back
[ 0.000589] A0000-BFFFF uncachable
[ 0.000590] C0000-CFFFF write-protect
[ 0.000591] D0000-DFFFF uncachable
[ 0.000592] E0000-FFFFF write-protect
[ 0.000593] MTRR variable ranges enabled:
[ 0.000594] 0 base 0000000000 mask 7C00000000 write-back
[ 0.000596] 1 base 0400000000 mask 7FE0000000 write-back
[ 0.000597] 2 base 0420000000 mask 7FF0000000 write-back
[ 0.000598] 3 base 00E0000000 mask 7FE0000000 uncachable
[ 0.000600] 4 base 00D0000000 mask 7FF0000000 uncachable
[ 0.000601] 5 base 00CC000000 mask 7FFC000000 uncachable
[ 0.000602] 6 base 00CBC00000 mask 7FFFC00000 uncachable
[ 0.000603] 7 base 042F800000 mask 7FFF800000 uncachable
[ 0.000604] 8 base 042F400000 mask 7FFFC00000 uncachable
[ 0.000605] 9 base 042F200000 mask 7FFFE00000 uncachable
[ 0.000692] x86/PAT: Configuration [0-7]: WB WC UC- UC WB WP UC- WT
[ 0.001242] total RAM covered: 16302M
[ 0.001350] gran_size: 64K chunk_size: 64K num_reg: 10 lose cover RAM: 242M
[ 0.001352] gran_size: 64K chunk_size: 128K num_reg: 10 lose cover RAM: 242M
[ 0.001354] gran_size: 64K chunk_size: 256K num_reg: 10 lose cover RAM: 242M
[ 0.001355] gran_size: 64K chunk_size: 512K num_reg: 10 lose cover RAM: 242M
[ 0.001356] gran_size: 64K chunk_size: 1M num_reg: 10 lose cover RAM: 242M
[ 0.001358] gran_size: 64K chunk_size: 2M num_reg: 10 lose cover RAM: 242M
[ 0.001359] gran_size: 64K chunk_size: 4M num_reg: 10 lose cover RAM: 242M
[ 0.001360] gran_size: 64K chunk_size: 8M num_reg: 10 lose cover RAM: 50M
[ 0.001362] *BAD*gran_size: 64K chunk_size: 16M num_reg: 10 lose cover RAM: -12M
[ 0.001363] *BAD*gran_size: 64K chunk_size: 32M num_reg: 10 lose cover RAM: -12M
[ 0.001365] *BAD*gran_size: 64K chunk_size: 64M num_reg: 10 lose cover RAM: -12M
[ 0.001366] *BAD*gran_size: 64K chunk_size: 128M num_reg: 10 lose cover RAM: -12M
[ 0.001367] *BAD*gran_size: 64K chunk_size: 256M num_reg: 10 lose cover RAM: -12M
[ 0.001369] *BAD*gran_size: 64K chunk_size: 512M num_reg: 10 lose cover RAM: -268M
[ 0.001370] *BAD*gran_size: 64K chunk_size: 1G num_reg: 10 lose cover RAM: -264M
[ 0.001372] *BAD*gran_size: 64K chunk_size: 2G num_reg: 10 lose cover RAM: -1288M
[ 0.001373] gran_size: 128K chunk_size: 128K num_reg: 10 lose cover RAM: 242M
[ 0.001374] gran_size: 128K chunk_size: 256K num_reg: 10 lose cover RAM: 242M
[ 0.001376] gran_size: 128K chunk_size: 512K num_reg: 10 lose cover RAM: 242M
[ 0.001377] gran_size: 128K chunk_size: 1M num_reg: 10 lose cover RAM: 242M
[ 0.001378] gran_size: 128K chunk_size: 2M num_reg: 10 lose cover RAM: 242M
[ 0.001380] gran_size: 128K chunk_size: 4M num_reg: 10 lose cover RAM: 242M
[ 0.001381] gran_size: 128K chunk_size: 8M num_reg: 10 lose cover RAM: 50M
[ 0.001382] *BAD*gran_size: 128K chunk_size: 16M num_reg: 10 lose cover RAM: -12M
[ 0.001384] *BAD*gran_size: 128K chunk_size: 32M num_reg: 10 lose cover RAM: -12M
[ 0.001385] *BAD*gran_size: 128K chunk_size: 64M num_reg: 10 lose cover RAM: -12M
[ 0.001386] *BAD*gran_size: 128K chunk_size: 128M num_reg: 10 lose cover RAM: -12M
[ 0.001388] *BAD*gran_size: 128K chunk_size: 256M num_reg: 10 lose cover RAM: -12M
[ 0.001389] *BAD*gran_size: 128K chunk_size: 512M num_reg: 10 lose cover RAM: -268M
[ 0.001390] *BAD*gran_size: 128K chunk_size: 1G num_reg: 10 lose cover RAM: -264M
[ 0.001392] *BAD*gran_size: 128K chunk_size: 2G num_reg: 10 lose cover RAM: -1288M
[ 0.001393] gran_size: 256K chunk_size: 256K num_reg: 10 lose cover RAM: 242M
[ 0.001394] gran_size: 256K chunk_size: 512K num_reg: 10 lose cover RAM: 242M
[ 0.001396] gran_size: 256K chunk_size: 1M num_reg: 10 lose cover RAM: 242M
[ 0.001397] gran_size: 256K chunk_size: 2M num_reg: 10 lose cover RAM: 242M
[ 0.001398] gran_size: 256K chunk_size: 4M num_reg: 10 lose cover RAM: 242M
[ 0.001399] gran_size: 256K chunk_size: 8M num_reg: 10 lose cover RAM: 50M
[ 0.001401] *BAD*gran_size: 256K chunk_size: 16M num_reg: 10 lose cover RAM: -12M
[ 0.001402] *BAD*gran_size: 256K chunk_size: 32M num_reg: 10 lose cover RAM: -12M
[ 0.001403] *BAD*gran_size: 256K chunk_size: 64M num_reg: 10 lose cover RAM: -12M
[ 0.001405] *BAD*gran_size: 256K chunk_size: 128M num_reg: 10 lose cover RAM: -12M
[ 0.001406] *BAD*gran_size: 256K chunk_size: 256M num_reg: 10 lose cover RAM: -12M
[ 0.001407] *BAD*gran_size: 256K chunk_size: 512M num_reg: 10 lose cover RAM: -268M
[ 0.001409] *BAD*gran_size: 256K chunk_size: 1G num_reg: 10 lose cover RAM: -264M
[ 0.001410] *BAD*gran_size: 256K chunk_size: 2G num_reg: 10 lose cover RAM: -1288M
[ 0.001411] gran_size: 512K chunk_size: 512K num_reg: 10 lose cover RAM: 242M
[ 0.001413] gran_size: 512K chunk_size: 1M num_reg: 10 lose cover RAM: 242M
[ 0.001414] gran_size: 512K chunk_size: 2M num_reg: 10 lose cover RAM: 242M
[ 0.001415] gran_size: 512K chunk_size: 4M num_reg: 10 lose cover RAM: 242M
[ 0.001416] gran_size: 512K chunk_size: 8M num_reg: 10 lose cover RAM: 50M
[ 0.001418] *BAD*gran_size: 512K chunk_size: 16M num_reg: 10 lose cover RAM: -12M
[ 0.001419] *BAD*gran_size: 512K chunk_size: 32M num_reg: 10 lose cover RAM: -12M
[ 0.001420] *BAD*gran_size: 512K chunk_size: 64M num_reg: 10 lose cover RAM: -12M
[ 0.001422] *BAD*gran_size: 512K chunk_size: 128M num_reg: 10 lose cover RAM: -12M
[ 0.001423] *BAD*gran_size: 512K chunk_size: 256M num_reg: 10 lose cover RAM: -12M
[ 0.001424] *BAD*gran_size: 512K chunk_size: 512M num_reg: 10 lose cover RAM: -268M
[ 0.001426] *BAD*gran_size: 512K chunk_size: 1G num_reg: 10 lose cover RAM: -264M
[ 0.001427] *BAD*gran_size: 512K chunk_size: 2G num_reg: 10 lose cover RAM: -1288M
[ 0.001428] gran_size: 1M chunk_size: 1M num_reg: 10 lose cover RAM: 242M
[ 0.001430] gran_size: 1M chunk_size: 2M num_reg: 10 lose cover RAM: 242M
[ 0.001431] gran_size: 1M chunk_size: 4M num_reg: 10 lose cover RAM: 242M
[ 0.001432] gran_size: 1M chunk_size: 8M num_reg: 10 lose cover RAM: 50M
[ 0.001434] *BAD*gran_size: 1M chunk_size: 16M num_reg: 10 lose cover RAM: -12M
[ 0.001435] *BAD*gran_size: 1M chunk_size: 32M num_reg: 10 lose cover RAM: -12M
[ 0.001436] *BAD*gran_size: 1M chunk_size: 64M num_reg: 10 lose cover RAM: -12M
[ 0.001438] *BAD*gran_size: 1M chunk_size: 128M num_reg: 10 lose cover RAM: -12M
[ 0.001439] *BAD*gran_size: 1M chunk_size: 256M num_reg: 10 lose cover RAM: -12M
[ 0.001440] *BAD*gran_size: 1M chunk_size: 512M num_reg: 10 lose cover RAM: -268M
[ 0.001441] *BAD*gran_size: 1M chunk_size: 1G num_reg: 10 lose cover RAM: -264M
[ 0.001443] *BAD*gran_size: 1M chunk_size: 2G num_reg: 10 lose cover RAM: -1288M
[ 0.001444] gran_size: 2M chunk_size: 2M num_reg: 10 lose cover RAM: 242M
[ 0.001445] gran_size: 2M chunk_size: 4M num_reg: 10 lose cover RAM: 242M
[ 0.001447] gran_size: 2M chunk_size: 8M num_reg: 10 lose cover RAM: 50M
[ 0.001448] *BAD*gran_size: 2M chunk_size: 16M num_reg: 10 lose cover RAM: -12M
[ 0.001449] *BAD*gran_size: 2M chunk_size: 32M num_reg: 10 lose cover RAM: -12M
[ 0.001450] *BAD*gran_size: 2M chunk_size: 64M num_reg: 10 lose cover RAM: -12M
[ 0.001452] *BAD*gran_size: 2M chunk_size: 128M num_reg: 10 lose cover RAM: -12M
[ 0.001453] *BAD*gran_size: 2M chunk_size: 256M num_reg: 10 lose cover RAM: -12M
[ 0.001454] *BAD*gran_size: 2M chunk_size: 512M num_reg: 10 lose cover RAM: -268M
[ 0.001456] *BAD*gran_size: 2M chunk_size: 1G num_reg: 10 lose cover RAM: -264M
[ 0.001457] *BAD*gran_size: 2M chunk_size: 2G num_reg: 10 lose cover RAM: -1288M
[ 0.001458] gran_size: 4M chunk_size: 4M num_reg: 10 lose cover RAM: 242M
[ 0.001460] gran_size: 4M chunk_size: 8M num_reg: 10 lose cover RAM: 50M
[ 0.001461] gran_size: 4M chunk_size: 16M num_reg: 10 lose cover RAM: 50M
[ 0.001462] gran_size: 4M chunk_size: 32M num_reg: 10 lose cover RAM: 2M
[ 0.001464] gran_size: 4M chunk_size: 64M num_reg: 10 lose cover RAM: 2M
[ 0.001465] gran_size: 4M chunk_size: 128M num_reg: 10 lose cover RAM: 2M
[ 0.001466] gran_size: 4M chunk_size: 256M num_reg: 10 lose cover RAM: 2M
[ 0.001467] *BAD*gran_size: 4M chunk_size: 512M num_reg: 10 lose cover RAM: -254M
[ 0.001469] gran_size: 4M chunk_size: 1G num_reg: 10 lose cover RAM: 2M
[ 0.001470] *BAD*gran_size: 4M chunk_size: 2G num_reg: 10 lose cover RAM: -1022M
[ 0.001471] gran_size: 8M chunk_size: 8M num_reg: 10 lose cover RAM: 118M
[ 0.001473] gran_size: 8M chunk_size: 16M num_reg: 10 lose cover RAM: 54M
[ 0.001474] gran_size: 8M chunk_size: 32M num_reg: 10 lose cover RAM: 6M
[ 0.001475] gran_size: 8M chunk_size: 64M num_reg: 10 lose cover RAM: 6M
[ 0.001477] gran_size: 8M chunk_size: 128M num_reg: 10 lose cover RAM: 6M
[ 0.001478] gran_size: 8M chunk_size: 256M num_reg: 10 lose cover RAM: 6M
[ 0.001479] *BAD*gran_size: 8M chunk_size: 512M num_reg: 10 lose cover RAM: -250M
[ 0.001480] gran_size: 8M chunk_size: 1G num_reg: 10 lose cover RAM: 6M
[ 0.001482] *BAD*gran_size: 8M chunk_size: 2G num_reg: 10 lose cover RAM: -1018M
[ 0.001483] gran_size: 16M chunk_size: 16M num_reg: 10 lose cover RAM: 62M
[ 0.001484] gran_size: 16M chunk_size: 32M num_reg: 10 lose cover RAM: 14M
[ 0.001486] gran_size: 16M chunk_size: 64M num_reg: 10 lose cover RAM: 14M
[ 0.001487] gran_size: 16M chunk_size: 128M num_reg: 10 lose cover RAM: 14M
[ 0.001488] gran_size: 16M chunk_size: 256M num_reg: 10 lose cover RAM: 14M
[ 0.001490] *BAD*gran_size: 16M chunk_size: 512M num_reg: 10 lose cover RAM: -242M
[ 0.001491] gran_size: 16M chunk_size: 1G num_reg: 10 lose cover RAM: 14M
[ 0.001492] *BAD*gran_size: 16M chunk_size: 2G num_reg: 10 lose cover RAM: -1010M
[ 0.001494] gran_size: 32M chunk_size: 32M num_reg: 10 lose cover RAM: 46M
[ 0.001495] gran_size: 32M chunk_size: 64M num_reg: 10 lose cover RAM: 46M
[ 0.001496] gran_size: 32M chunk_size: 128M num_reg: 10 lose cover RAM: 46M
[ 0.001498] gran_size: 32M chunk_size: 256M num_reg: 10 lose cover RAM: 46M
[ 0.001499] *BAD*gran_size: 32M chunk_size: 512M num_reg: 10 lose cover RAM: -210M
[ 0.001500] gran_size: 32M chunk_size: 1G num_reg: 10 lose cover RAM: 46M
[ 0.001502] *BAD*gran_size: 32M chunk_size: 2G num_reg: 10 lose cover RAM: -978M
[ 0.001503] gran_size: 64M chunk_size: 64M num_reg: 8 lose cover RAM: 110M
[ 0.001504] gran_size: 64M chunk_size: 128M num_reg: 8 lose cover RAM: 110M
[ 0.001505] gran_size: 64M chunk_size: 256M num_reg: 9 lose cover RAM: 110M
[ 0.001507] gran_size: 64M chunk_size: 512M num_reg: 10 lose cover RAM: 110M
[ 0.001508] gran_size: 64M chunk_size: 1G num_reg: 9 lose cover RAM: 110M
[ 0.001509] gran_size: 64M chunk_size: 2G num_reg: 10 lose cover RAM: 110M
[ 0.001511] gran_size: 128M chunk_size: 128M num_reg: 7 lose cover RAM: 174M
[ 0.001512] gran_size: 128M chunk_size: 256M num_reg: 9 lose cover RAM: 174M
[ 0.001513] gran_size: 128M chunk_size: 512M num_reg: 10 lose cover RAM: 174M
[ 0.001515] gran_size: 128M chunk_size: 1G num_reg: 9 lose cover RAM: 174M
[ 0.001516] gran_size: 128M chunk_size: 2G num_reg: 10 lose cover RAM: 174M
[ 0.001517] gran_size: 256M chunk_size: 256M num_reg: 5 lose cover RAM: 430M
[ 0.001519] gran_size: 256M chunk_size: 512M num_reg: 5 lose cover RAM: 430M
[ 0.001520] gran_size: 256M chunk_size: 1G num_reg: 6 lose cover RAM: 430M
[ 0.001521] gran_size: 256M chunk_size: 2G num_reg: 7 lose cover RAM: 430M
[ 0.001522] gran_size: 512M chunk_size: 512M num_reg: 5 lose cover RAM: 430M
[ 0.001524] gran_size: 512M chunk_size: 1G num_reg: 6 lose cover RAM: 430M
[ 0.001525] gran_size: 512M chunk_size: 2G num_reg: 7 lose cover RAM: 430M
[ 0.001526] gran_size: 1G chunk_size: 1G num_reg: 4 lose cover RAM: 942M
[ 0.001528] gran_size: 1G chunk_size: 2G num_reg: 4 lose cover RAM: 942M
[ 0.001529] gran_size: 2G chunk_size: 2G num_reg: 3 lose cover RAM: 1966M
[ 0.001530] mtrr_cleanup: can not find optimal value
[ 0.001531] please specify mtrr_gran_size/mtrr_chunk_sizeLast edited by kristianheljas (2021-05-16 10:27:06)
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