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x86: mtrr cleanup for converting continuous to discrete - auto detect v4

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Loop through mtrr chunk_size and gran_size from 1M to 2G to find out
the optimal value so user does not need to add mtrr_chunk_size and
mtrr_gran_size to the kernel command line.

If optimal value is not found, print out all list to help select less
optimal value.

Add mtrr_spare_reg_nr= so user could set 2 instead of 1, if the card
need more entries.

v2: find the one with more spare entries
v3: fix hole_basek offset
v4: tight the compare between range and range_new
    loop stop with 4g

Signed-off-by: Yinghai Lu <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Gabriel C <[email protected]>
Cc: Mika Fischer <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Yinghai Lu 2008-05-02 02:40:22 -07:00 • committed by Thomas Gleixner
commit 12031a624a
3 changed files with 484 additions and 148 deletions
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13
Documentation/kernel-parameters.txt
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@ -610,8 +610,17 @@ and is between 256 and 4096 characters. It is defined in the file
that could hold holes aka. UC entries.
mtrr_gran_size=nn[KMG] [X86]
used for mtrr cleanup. It is granity of mtrr block.
Big value could prevent small alignment use up MTRRs.
Used for mtrr cleanup. It is granularity of mtrr block.
Default is 1.
Large value could prevent small alignment from
using up MTRRs.
mtrr_spare_reg_nr=n [X86]
Format: <integer>
Range: 0,7 : spare reg number
Default : 1
Used for mtrr cleanup. It is spare mtrr entries number.
Set to 2 or more if your graphical card needs more.
disable_mtrr_trim [X86, Intel and AMD only]
By default the kernel will trim any uncacheable