Re: 2.6.10-rc2-mm4

[Alan Cox]

On Maw, 2004-11-30 at 18:31, Christoph Hellwig wrote:
> The purpose is probably to work around 32bit DMA limited devices on the broken
> iAMD64 systems.
> 
> But I think it's a bad idea, x86_64 doesn't use CONFIG_HIGHMEM at all currenly,
> and it could easily use it for that purpose like in the patch in older RH
> kernels for ia64.

We had very bad experiences with zone balancing that configuration and
I'm concerned we'd see the same again with such a zone on systems.
Particulary since nothing I can find needs such a zone but can use
swiommu and the I/O MMU on some AMD boxes.


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