Re: Workarounds for LuaJIT's 4GB limit
- From: Javier Guerra Giraldez <javier@xxxxxxxxxxx>
- To: LuaJIT <luajit@xxxxxxxxxxxxx>
- Date: Tue, 21 Oct 2014 14:35:43 -0500
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.
--
Javier
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