1+ GB support (fwd)

1+ GB support (fwd)

[Rik van Riel]

Could somebody please write an FAQ about this (for use on the
Linux-MM site)... ? :)

Rik
---------- Forwarded message ----------
Date: Thu, 13 Jan 2000 15:19:00 -0800
From: Kelly Alexander <kelly@nvidia.com>
Reply-To: linux-mm-www@nl.linux.org
To: linux-mm-www@nl.linux.org
Subject: 1+ GB support

	
	I've read a bunch of linux news that says that the later kernels
such as 2.3.35 can support more than 1gb of memory.  I've put together a
system with 4gb of RAM (dell 6300, 2x PIII 550 xeon CPUs) and can see that
the kernel reports all 4gb is there and I can use 4gb if running multiple
processes.  However, I've been unable to malloc and use more than 1gb per
process.  Is this a limitation or am I doing something wrong?  I've tried to
use the obsolete FAQ on large memory to give me some ideas of where to poke
around but no luck so far.  Any ideas or pointers for me to investigate?

---
Kelly Alexander
nVidia Corporation    
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Re: 1+ GB support (fwd)

[Andrea Arcangeli]

>
>	I've read a bunch of linux news that says that the later kernels
>such as 2.3.35 can support more than 1gb of memory.  I've put together a
>system with 4gb of RAM (dell 6300, 2x PIII 550 xeon CPUs) and can see that

2.2.14aa1 supports 4g of RAM on IA32 and 2Terabyte of RAM on alpha (wihout
per-process limit on alpha) with production quality. Apply the below patch
against 2.2.14 if you can't run an unstable tree.

	ftp://ftp.*.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.2/2.2.14aa1.gz

>processes.  However, I've been unable to malloc and use more than 1gb per
>process.  Is this a limitation or am I doing something wrong?  I've tried to

If you use 2.2.14aa1 you can apply these two incremental patches (they
should go on the top of 2.3.x as well) to allocate more ram per-process
(something like 3.5G). The two incremental patches are _not_ a good idea
if you need a large I/O cache (like for webservers). For scientific
application that only needs lots of RAM they should be fine.

	ftp://ftp.*.kernel.org/pub/linux/kernel/people/andrea/patches/v2.2/2.2.14/bigmem-large-mapping-1.gz
	ftp://ftp.*.kernel.org/pub/linux/kernel/people/andrea/patches/v2.2/2.2.14/patches/v2.2/2.2.14/bigmem-large-task-1.gz

Andrea

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