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SubjectRe: [PATCH] 1-2-3 GB
From
>  > The 3 patches in this thread combined into one, with a default
> > config option of 2GB, and help saying, if unsure, say "1GB":
>
> This may be confusing for some, bringing up the question
> "I'm unsure, but why is the default at 2GB?"
>
> Default option should match default advice.
>
> --
> | Dave Jones. http://www.codemonkey.org.uk

Good point. This Configure.help for 2.4.18pre4aa1 may be better:


--- linux-2.4.18pre4aa1/Documentation/Configure.help Tue Jan 22 21:25:55 2002
+++ linux/Documentation/Configure.help Tue Jan 22 22:51:11 2002
@@ -376,6 +376,34 @@
Select this if you have a 32-bit processor and more than 4
gigabytes of physical RAM.

+User address space size
+CONFIG_1GB
+ If you have 4 Gigabytes of physical memory or less, you can change
+ where the kernel maps high memory.
+
+ Typically there will 128 megabytes less "user memory" mapped
+ than the number in the configuration option. Saying that
+ another way, "high memory" will usually start 128 megabytes
+ lower than the configuration option.
+
+ Selecting "05GB" results in a "3.5GB/0.5GB" kernel/user split:
+ On a system with 1 gigabyte of physical memory, you may get 384
+ megabytes of "user memory" and 640 megabytes of "high memory"
+ with this selection.
+
+ Selecting "1GB" results in a "3GB/1GB" kernel/user split:
+ On a system with 1 gigabyte of memory, you may get 896 MB of
+ "user memory" and 128 megabytes of "high memory" with this
+ selection. This is the usual setting.
+
+ Selecting "2GB" results in a "2GB/2GB" kernel/user split:
+ On a system with less than 1.75 gigabytes of physical memory,
+ this option will make it so no memory is mapped as "high".
+
+ Selecting "3GB" results in a "1GB/3GB" kernel/user split:
+
+ If unsure, say "1GB".
+
HIGHMEM I/O support
CONFIG_HIGHIO
If you want to be able to do I/O to high memory pages, say Y.
--
Randy Hron

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