RE: 2.6.32-rc3: low mem - only 378MB on x86_32 with 64GB. Why?

[Yuhong Bao]

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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=
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