Messages in this thread Patch in this message |  | | Date | Tue, 22 Jan 2002 22:53:35 -0500 | Subject | Re: [PATCH] 1-2-3 GB | From | rwhron@earthlin ... |
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> > 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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