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authorAndi Kleen <andi@firstfloor.org>2009-09-21 17:01:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-22 07:17:26 -0700
commit3b2b9a875ddcbf9fcd667db9f961a6a163bd083f (patch)
tree78063d2a7ecd8ba0060f7b97b3152e342d8e6614 /Documentation/memory.txt
parent3701b0332330ca1add3e5d56513ef201ff7efdbb (diff)
downloadlinux-linaro-stable-3b2b9a875ddcbf9fcd667db9f961a6a163bd083f.tar.gz
Documentation/memory.txt: remove some very outdated recommendations
Remove some very outdated recommendations in Documentation/memory.txt Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/memory.txt')
-rw-r--r--Documentation/memory.txt31
1 files changed, 2 insertions, 29 deletions
diff --git a/Documentation/memory.txt b/Documentation/memory.txt
index 2b3dedd39538..802efe58647c 100644
--- a/Documentation/memory.txt
+++ b/Documentation/memory.txt
@@ -1,18 +1,7 @@
There are several classic problems related to memory on Linux
systems.
- 1) There are some buggy motherboards which cannot properly
- deal with the memory above 16MB. Consider exchanging
- your motherboard.
-
- 2) You cannot do DMA on the ISA bus to addresses above
- 16M. Most device drivers under Linux allow the use
- of bounce buffers which work around this problem. Drivers
- that don't use bounce buffers will be unstable with
- more than 16M installed. Drivers that use bounce buffers
- will be OK, but may have slightly higher overhead.
-
- 3) There are some motherboards that will not cache above
+ 1) There are some motherboards that will not cache above
a certain quantity of memory. If you have one of these
motherboards, your system will be SLOWER, not faster
as you add more memory. Consider exchanging your
@@ -24,7 +13,7 @@ It can also tell Linux to use less memory than is actually installed.
If you use "mem=" on a machine with PCI, consider using "memmap=" to avoid
physical address space collisions.
-See the documentation of your boot loader (LILO, loadlin, etc.) about
+See the documentation of your boot loader (LILO, grub, loadlin, etc.) about
how to pass options to the kernel.
There are other memory problems which Linux cannot deal with. Random
@@ -42,19 +31,3 @@ Try:
with the vendor. Consider testing it with memtest86 yourself.
* Exchanging your CPU, cache, or motherboard for one that works.
-
- * Disabling the cache from the BIOS.
-
- * Try passing the "mem=4M" option to the kernel to limit
- Linux to using a very small amount of memory. Use "memmap="-option
- together with "mem=" on systems with PCI to avoid physical address
- space collisions.
-
-
-Other tricks:
-
- * Try passing the "no-387" option to the kernel to ignore
- a buggy FPU.
-
- * Try passing the "no-hlt" option to disable the potentially
- buggy HLT instruction in your CPU.