diff options
author | Yinghai Lu <yhlu.kernel.send@gmail.com> | 2008-04-29 06:52:33 -0400 |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2008-05-25 04:55:09 -0400 |
commit | 95ffa2438d0e9c48779f0106b1c0eb36165e759c (patch) | |
tree | 63829c04435fd99fb655a0d1b94fbd2094549ceb /Documentation | |
parent | 0dbfafa5fcd4dd189e2adc7b6ed9e0405e846d79 (diff) |
x86: mtrr cleanup for converting continuous to discrete layout, v8
some BIOS like to use continus MTRR layout, and X driver can not add
WB entries for graphical cards when 4g or more RAM installed.
the patch will change MTRR to discrete.
mtrr_chunk_size= could be used to have smaller continuous block to hold holes.
default is 256m, could be set according to size of graphics card memory.
mtrr_gran_size= could be used to send smallest mtrr block to avoid run out of MTRRs
v2: fix -1 for UC checking
v3: default to disable, and need use enable_mtrr_cleanup to enable this feature
skip the var state change warning.
remove next_basek in range_to_mtrr()
v4: correct warning mask.
v5: CONFIG_MTRR_SANITIZER
v6: fix 1g, 2g, 512 aligment with extra hole
v7: gran_sizek to prevent running out of MTRRs.
v8: fix hole_basek caculation caused when removing next_basek
gran_sizek using when basek is 0.
need to apply
[PATCH] x86: fix trimming e820 with MTRR holes.
right after this one.
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/kernel-parameters.txt | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index e07c432c731f..44427607b7c6 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt | |||
@@ -599,6 +599,20 @@ and is between 256 and 4096 characters. It is defined in the file | |||
599 | See drivers/char/README.epca and | 599 | See drivers/char/README.epca and |
600 | Documentation/digiepca.txt. | 600 | Documentation/digiepca.txt. |
601 | 601 | ||
602 | disable_mtrr_cleanup [X86] | ||
603 | enable_mtrr_cleanup [X86] | ||
604 | The kernel tries to adjust MTRR layout from continuous | ||
605 | to discrete, to make X server driver able to add WB | ||
606 | entry later. This parameter enables/disables that. | ||
607 | |||
608 | mtrr_chunk_size=nn[KMG] [X86] | ||
609 | used for mtrr cleanup. It is largest continous chunk | ||
610 | that could hold holes aka. UC entries. | ||
611 | |||
612 | mtrr_gran_size=nn[KMG] [X86] | ||
613 | used for mtrr cleanup. It is granity of mtrr block. | ||
614 | Big value could prevent small alignment use up MTRRs. | ||
615 | |||
602 | disable_mtrr_trim [X86, Intel and AMD only] | 616 | disable_mtrr_trim [X86, Intel and AMD only] |
603 | By default the kernel will trim any uncacheable | 617 | By default the kernel will trim any uncacheable |
604 | memory out of your available memory pool based on | 618 | memory out of your available memory pool based on |