How FreeBSD manage more than 4GB on 32 bits architecture

[Pierre-Yves Péneau]

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On 04/13/2015 11:08 PM, Adrian Chadd wrote:
> On 13 April 2015 at 03:46, Pierre-Yves Péneau 
> <Pierre-Yves.Peneau at lip6.fr> wrote: Thanks everyone for your 
> advices.
> 
> If FreeBSD is chose for this work, I'll look at PAE and MIPS 
> support.
> 
>> Hi!
> 
>> If there's anything we can do to help you along with choosing 
>> FreeBSD then please don't hesitate to ask!
> 
> 
> 
>> -adrian
> 
> 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 _______________________________________________ 
>>>> freebsd-questions at freebsd.org mailing list 
>>>> http://lists.freebsd.org/mailman/listinfo/freebsd-questions
>>>> To unsubscribe, send any mail to 
>>>> "freebsd-questions-unsubscribe at freebsd.org"
>>>> 
> 
> 
>> 
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> 

Thanks Adrian.

I can't change the operating system *now*. For my internship,
I've to use an homemade OS specially designed for our architecture
(TSAR). But I really think this OS should be changed, and I'll try to do
that for my PhD.

- -- 
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