[patch] morethan900MB-2.0.36

MOLNAR Ingo (mingo@chiara.csoma.elte.hu)
Fri, 4 Dec 1998 16:50:53 +0100 (CET)


On Thu, 3 Dec 1998, Leonard N. Zubkoff wrote:

> I have created a patch for Linux 2.0.36 that allows up to 2GB of physical
> memory to be utilized since we have customers that need this much or even more
> physical memory. [...]

we _definitely_ need support for more than 2G physical RAM. (eg. the
Torrent system demo on OracleWorld was run on a box with 2.5G RAM.) Also,
a 2G+2G split has performance disadvantages if the box in question has
less memory (eg. 1G RAM).

i've attached a backport of my 2.1 patch that makes the amount of
physical/virtual memory fine-tunable. (the patch is against 2.0.36).
Instead of a static split like the original kernel (and your patch,
apparently) this patch supports up to ~3.5G physical RAM, and also it does
auto-clipping and prints a warning message if available RAM is more than
configured RAM. (see Documentation/more-than-900MB-RAM.txt how to set it
up)

i've tested the patch under SMP and UP kernels, with various settings, it
works just fine. The patch does not enforce any particular 'split', it can
be configured eg 3G physical + 1G virtual too if necessary. the
unconditional 2G/2G split has some performance disadvantages, so one wants
to tune the split as much as possible. My patch enforces the 128M RAM
necessary for vmalloc() and ioremap().

-- mingo

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8Z0RM$GQ$,"",*S@XG2+_/V!=GA/Q-0``
`
end

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