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authorYinghai Lu <yhlu.kernel.send@gmail.com>2008-05-02 02:40:22 -0700
committerThomas Gleixner <tglx@linutronix.de>2008-05-25 10:55:10 +0200
commit12031a624af7816ec7660b82be648aa3703b4ebe (patch)
tree254122ef3adebcfa51f7ffa1a7227ff1baee1d54 /Documentation/kernel-parameters.txt
parentf5098d62c1d1cede8ff23d01bbf50a421f110562 (diff)
x86: mtrr cleanup for converting continuous to discrete - auto detect v4
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 <yhlu.kernel@gmail.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Gabriel C <nix.or.die@googlemail.com> Cc: Mika Fischer <mika.fischer@zoopnet.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
-rw-r--r--Documentation/kernel-parameters.txt13
1 files changed, 11 insertions, 2 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 44427607b7c..2000977af77 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -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