Messages in this thread | | | Subject | Re: 2.6.10-rc2-mm4 | From | Alan Cox <> | Date | Tue, 30 Nov 2004 18:38:37 +0000 |
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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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