Followup to: <[EMAIL PROTECTED]>
By author:[EMAIL PROTECTED] (Eric W. Biederman)
In newsgroup: linux.dev.kernel
>
> The AMD760 which looks like it might walk on both the alpha, an x86
> side of the fence also has an iommu. Mostly it's used for AGP but
> according to the docs it should be ab
Richard Henderson <[EMAIL PROTECTED]> writes:
> On Thu, Jun 07, 2001 at 02:22:10PM -0700, Linus Torvalds wrote:
> > For example, what's the difference between ZONE_HIGHMEM and ZONE_NORMAL
> > on a sane 64-bit architecture (right now I _think_ the 64-bit architectures
> > actually make ZONE_NORMAL
Richard Henderson writes:
> On most alphas we use only one zone -- ZONE_DMA. The iommu makes it
> possible to do 32-bit pci to the entire memory space.
>
> For those alphas without an iommu, we also set up ZONE_NORMAL.
And on sparc64 since all machines have an iommu, we use just ZONE_DMA
f
On Thu, 7 Jun 2001, Jens Axboe wrote:
>
> I'd like to push this patch from the block highmem patch set, to prune
> it down and make it easier to include it later on :-)
>
> This patch implements a new memory zone, ZONE_DMA32. It holds highmem
> pages that are below 4GB, as we can do I/O on thos
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