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Message-ID: <alpine.LFD.2.01.0910051110200.3432@localhost.localdomain>
Date: Mon, 5 Oct 2009 11:12:06 -0700 (PDT)
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Jeff Chua <jeff.chua.linux@...il.com>
cc: Linux Kernel <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Hugh Dickins <hugh@...itas.com>
Subject: Re: 2.6.32-rc3: low mem - only 378MB on x86_32 with 64GB. Why?
On Mon, 5 Oct 2009, Jeff Chua wrote:
>
> I've 3 systems with 4GB, 16GB and 64GB all running 32bit with these set:
Don't.
4GB is useable. 8GB is borderline. 16GB+ and nobody will care.
> # with 64GB
> total used free shared buffers cached
> Mem: 63995 524 63470 0 4 365
> Low: 378 32 345
All your low memory is used for the 'struct page' arrays that describe
everything else.
> Anything I should do?
Use a 64-bit CPU and kernel or limit your memory to 8GB or so. No ifs,
buts and maybe's.
Linus
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