Messages in this thread | | | Date | Mon, 1 Feb 1999 12:40:50 +0100 (MET) | From | Max <> | Subject | Re: [PATCH] ramdisk for unusable memory > 960MB / > 2 GB |
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On Mon, 1 Feb 1999, Manfred Spraul wrote:
>This patch adds: >- 2 new kernel functions (alloc_hugemem, free_hugemem) that manage >physical, unmapped memory. (Note: if you have 1 GB memory, then there is >usually 64 MB unused memory). >- a special ramdisk that uses this memory. ( MAJOR=126, MINOR=0..7)
The idea is nice, but the help is fuzzy:
>+Hugeram Ramdisk >+CONFIG_BLK_DEV_HUGERAMD >+ Saying Y here makes it possible to use the memory above 1 gigabyte >+ as a ramdisk. This only works if you have enabled CONFIG_HUGEMEM.
>+Huge memory support >+CONFIG_HUGEMEM >+ Enables kernel support for more than 2 gigabyte physical memory. >+ Note that this memory is only used for special devices such as >+ hugeramd. >+ >+ If unsure, say 'N'. >+
What about this:
---------------------------------------------------------------- Huge memory support CONFIG_HUGEMEM Enables kernel support for really huge amounts of RAM (beyond 1 Gigabyte)
Linux currently supports up to almost 1 Gigabyte of RAM (960MB to be exact) on Intel and compatibles computers. If this is too little for you, there are two things you can do:
1: Increase manually the limit to 1984MB. Read the note in include/linux/page.h to do this. 2: Use the RAM above the 960MB limit (or above 1984MB if you applied 1:) as a special ramdisk.
Saying Y here makes it possible to use the solution 2: use the RAM above the limit as a ramdisk.
Note that to actually enable this ramdisk, you must also say Y to the "Huge Ramdisk support" below.
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Huge Ramdisk support CONFIG_BLK_DEV_HUGERAMD Saying Y here makes it possible to use the memory above 1 Gigabyte as a ramdisk. This only works if you have enabled "Huge Memory support".
The ramdisk can be accessed through block special files /dev/hugeram0 ... /dev/hugeram7, with major number 126 and minor numbers 0..7 (do "man mknod" for help how to create them)
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Also, the note in linux/include/asm-i386/page.h was fixed (0x7000000 -> 0x80000000) in 2.2.1 so everything should be fine.
Massimiliano Ghilardi
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