Messages in this thread | | | Date | Mon, 21 May 2001 13:00:34 +0200 | From | Andrea Arcangeli <> | Subject | Re: alpha iommu fixes |
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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 ;)
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