Am Samstag, 30. Oktober 2004 17:07 schrieb Alan Stern:
> problem. Another part is that user-space pages may be located in high
> memory, not directly accessible to the kernel. Not all USB host
> controllers use DMA, and very few of them can go above the 4 GB cutoff.
> (However this issue doesn't seem to bother users of the sg and st drivers,
> and the majority of USB controllers _do_ use DMA.)
1. more than 4GB is rare
2. No iommu is rare
3. high performance SCSI & FibreChannel that can't do 64bit dma is rare
USB might have a real problem here. Thus I propose to allocate memory
in usbfs and let it be mmapped.
Regards
Oliver
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