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authorYinghai Lu <Yinghai.Lu@Sun.COM>2008-01-30 13:33:32 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-30 13:33:32 +0100
commit093af8d7f0ba3c6be1485973508584ef081e9f93 (patch)
tree0a2db2401e09764e654efafbea60f6d5d6894dcd /Documentation
parent11201e603d28a1cb7a4bb1d65f39e61629c97a28 (diff)
downloadlinaro-lsk-093af8d7f0ba3c6be1485973508584ef081e9f93.tar.gz
x86_32: trim memory by updating e820
when MTRRs are not covering the whole e820 table, we need to trim the RAM and need to update e820. reuse some code on 64-bit as well. here need to add early_get_cap and use it in early_cpu_detect, and move mtrr_bp_init early. The code successfully trimmed the memory map on Justin's system: from: [ 0.000000] BIOS-e820: 0000000100000000 - 000000022c000000 (usable) to: [ 0.000000] modified: 0000000100000000 - 0000000228000000 (usable) [ 0.000000] modified: 0000000228000000 - 000000022c000000 (reserved) According to Justin it makes quite a difference: | When I boot the box without any trimming it acts like a 286 or 386, | takes about 10 minutes to boot (using raptor disks). Signed-off-by: Yinghai Lu <yinghai.lu@sun.com> Tested-by: Justin Piszcz <jpiszcz@lucidpixels.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.txt2
1 files changed, 1 insertions, 1 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 50d564dabb1..fe3031d5643 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -583,7 +583,7 @@ and is between 256 and 4096 characters. It is defined in the file
See drivers/char/README.epca and
Documentation/digiepca.txt.
- disable_mtrr_trim [X86-64, Intel only]
+ disable_mtrr_trim [X86, Intel and AMD only]
By default the kernel will trim any uncacheable
memory out of your available memory pool based on
MTRR settings. This parameter disables that behavior,