linux-kernel - Re: [gentoo-user] RAM installed vs reported

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Date:	Fri, 01 Jan 2010 14:38:25 +0100
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Thanasis <thanasis@...r.hopto.org>
Cc:	gentoo-user@...ts.gentoo.org,
	Dirk Heinrichs <dirk.heinrichs@...ine.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [gentoo-user] RAM installed vs reported

Thanasis <thanasis@...r.hopto.org> writes:

>> Depends on the "split" used. With 2 GB : 2 GB you can have all-lowmem
>> 1.5 GB RAM, without CONFIG_HIGHMEM*. 2 GB of per-process address space
>> is usually not a problem.
> How do you implement that? What do you mean 2GB:2GB split ?

See "make menuconfig", Processor type and features -> Memory split. You
need to select "EMBEDDED" and "EXPERIMENTAL" first. What you need for
1.5 GB RAM is VMSPLIT_2G.

The idea is that the CPU address space is divided: ca. 2 GB (in this
configuration) for user space (for each process - instead of 3 GB),
2 GB - 128 MB (or something like that, I don't remember exactly) for
physical RAM, and the last 128 MB or so for PCI devices and other
things.
-- 
Krzysztof Halasa
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