Messages in this thread | | | From | David Mosberger <> | Date | Fri, 25 Jun 2004 22:02:50 -0700 | Subject | Re: 32-bit dma allocations on 64-bit platforms |
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Terence,
>>>>> On Wed, 23 Jun 2004 13:35:35 -0500, Terence Ripperda <tripperda@nvidia.com> said:
Terence> based on each architecture's paging_init routines, the Terence> zones look like this:
Terence> x86: ia64: x86_64: Terence> ZONE_DMA: < 16M < ~4G < 16M Terence> ZONE_NORMAL: 16M - ~1G > ~4G > 16M Terence> ZONE_HIMEM: 1G+
Not that it matters here, but for correctness let me note that the ia64 column is correct only for machines which don't have an I/O MMU. With I/O MMU, ZONE_DMA will have the same coverage as ZONE_NORMAL with a recent enough kernel (older kernels had a bug which limited ZONE_DMA to < 4GB, but that was unintentional).
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