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    SubjectRe: alpha iommu fixes
    On Mon, May 21, 2001 at 03:19:54AM -0700, David S. Miller wrote:
    > max bytes per bttv: max_gbuffers * max_gbufsize
    > 64 * 0x208000 == 133.12MB
    >
    > 133.12MB * 8 PCI slots == ~1.06 GB
    >
    > Which is still only half of the total IOMMU space available per
    > controller.

    and it is the double of the iommu space that I am going to reserve for
    pci dynamic mappings on the tsunami (right now it is 128Mbyte... and I'll
    change to 512mbyte) also bttv is not doing that a large dma and by
    default it only uses 2 buffers in the ring. bttv is not a good example
    of what can really overflow the pci virtual address space in real life
    (when I mentioned it it was only to point out it still uses
    virt_to_bus), filling a pci bus with bttv cards sounds quite silly
    anyways ;)

    Andrea
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