[haiku-development] Re: 64 bit physical addresses
- From: "Axel Dörfler" <axeld@xxxxxxxxxxxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Tue, 22 Jun 2010 16:23:38 +0200
Ingo Weinhold <ingo_weinhold@xxxxxx> wrote:
> (I believe graphic card drivers can support DMA from/to user-provided
> memory)
While in theory yes, our drivers currently don't do that.
> I intend to add a boot loader safemode setting and a kernel settings
> file
> option to enable/disable PAE. So there are essentially the following
> options:
>
> 1. Don't build PAE support in.
> 2. Build PAE support in, but make it opt-in via kernel settings.
> 3. Build PAE support in, but make it opt-out via kernel settings.
>
> Opinions?
Since it is only used when needed, 3. sounds like the best option to
me.
I'm not sure translating all 32 bit area creations as contiguous is a
good idea, as that may greatly hurt the performance (not just
speedwise).
Bye,
Axel.
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