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SubjectRe: [PATCH 2.4.30-pre3] x86_64: pci_alloc_consistent() match 2.6 implementation
FromArjan van de Ven <>
DateSat, 19 Mar 2005 07:09:45 +0100
On Fri, 2005-03-18 at 15:23 -0600, Matt Domsch wrote:
> For review and comment.
> 
> On x86_64 systems with no IOMMU and with >4GB RAM (in fact, whenever
> there are any pages mapped above 4GB), pci_alloc_consistent() falls
> back to using ZONE_DMA for all allocations, even if the device's
> dma_mask could have supported using memory from other zones.  Problems
> can be seen when other ZONE_DMA users (SWIOTLB, scsi_malloc()) consume
> all of ZONE_DMA, leaving none left for pci_alloc_consistent() use.

scsi_malloc no longer uses ZONE_DMA nowadays....

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