Re: Workarounds for LuaJIT's 4GB limit
- From: René Rebe <rene@xxxxxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Wed, 22 Oct 2014 12:31:30 +0200
On Oct 21, 2014, at 21:35, Javier Guerra Giraldez <javier@xxxxxxxxxxx> wrote:
> On Tue, Oct 21, 2014 at 12:17 PM, Sean Conner <sean@xxxxxxxxxx> wrote:
>>> The architecture is limited to 48 bits,
>>
>> Physical. There's a difference between virtual (or logical) addresses and
>> physical addresses.
>
>
> originally the logical/physical limits were 48/40 bits, but at some
> point the physical limit was raised to 48 without changing the logical
> one.
>
> i really don't know about the details, but i've read somewhere that
> the current IOMMU table imposes another limit at 52 bits. not sure if
> it's only physical or if it limits logical addresses too.
model name : AMD Opteron(TM) Processor 6274
address sizes : 48 bits physical, 48 bits virtual
model name : Dual-Core AMD Opteron(tm) Processor 1218
address sizes : 40 bits physical, 48 bits virtual
model name : Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz
address sizes : 36 bits physical, 48 bits virtual
model name : Intel(R) Atom(TM) CPU 330 @ 1.60GHz
address sizes : 32 bits physical, 48 bits virtual
> --
> Javier
René
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