linux-kernel - RE: 2.6.32-rc3: low mem - only 378MB on x86

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Date:	Tue, 6 Oct 2009 09:50:05 -0700
From:	Yuhong Bao <yuhongbao_386@...mail.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	<jeff.chua.linux@...il.com>, <linux-kernel@...r.kernel.org>,
	<akpm@...ux-foundation.org>, <hugh@...itas.com>
Subject: RE: 2.6.32-rc3: low mem - only 378MB on x86_32 with 64GB. Why?


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> On Mon=2C 5 Oct 2009=2C Jeff Chua wrote:
>>
>> I've 3 systems with 4GB=2C 16GB and 64GB all running 32bit with these se=
t:
>
> 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=2C
> buts and maybe's.
>
> Linus
Even Windows limits the amount of RAM to 16 GB when both PAE and it's 3G/1G=
 split mode is enabled for precisely the same reason.(It defaults to 2G/2G =
split mode)
See this for more info:http://blogs.msdn.com/oldnewthing/archive/2004/08/18=
/216492.aspx

Yuhong Bao 		 	   		  =0A=
_________________________________________________________________=0A=
Hotmail: Free=2C trusted and rich email service.=0A=
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