How FreeBSD manage more than 4GB on 32 bits architecture

[Pierre-Yves Péneau]

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Thanks everyone for your advices.

If FreeBSD is chose for this work, I'll look at PAE and MIPS support.

On 04/10/2015 09:16 PM, Adrian Chadd wrote:
> Hi!
> 
> Everyone - this is a research project. If they want to hack around 
> with FreeBSD on a PAE style 32 bit system but massively parallel, 
> please let them. If they hit the same walls as others have hit,
> hey, great. But they may come up with something novel.
> 
> Pierre - thanks for looking into it. Yes, there's PAE support in 
> FreeBSD. Yes, there's some NUMA domain awareness in FreeBSD.
> You're definitely not starting from scratch. I don't know of any
> PAE style awareness in the MIPS32 code; that would be a good place
> to start investigating.
> 
> So please take a look at what PAE / i386 is doing and see if you
> can map that to vm and pmap management for MIPS32. It'd likely
> overlap a lot with how we would support > 256MB of RAM on MIPS32 -
> right now we just use the direct map setup for everything, and
> that's limited to the KSEG sizes of 256MB.
> 
> 
> 
> -adrian _______________________________________________ 
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> 


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