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SubjectRe: Using video memory as system memory

How fast can one drive a pci card video memory? I once came up with the
idea to use the video memory of a pci video card as a block device and use it to
put the journal from ext3. Of course it wouldn't be solid state like the cards in the
market, at least without a battery and some circuitry changes, and i dismissed
the idea as the result of too much caffeine in my blood.



/Pedro

On 11 Apr 2002 at 16:23, Pavel Machek wrote:

> Hi!
>
> > Does the kernel support noncontiguous main memory like this, or is
> > it just plain impossible to use PCI-mapped memory as main memory?
>
> It might be possible (don't know why it does not work for you), but
> bear in mind that PCI is *very* slow compared to your main memory.
>
> [Oh, you might want to add that memory late in boot phase. At begining
> of kernel boot, that area is probably not mapped, yet. PCI is
> initialized later.]
> Pavel
> --

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