Messages in this thread | | | Date | Sun, 20 May 2001 16:12:34 +0400 | From | Ivan Kokshaysky <> | Subject | Re: alpha iommu fixes |
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On Sun, May 20, 2001 at 04:40:13AM +0200, Andrea Arcangeli wrote: > I was only talking about when you get the "pci_map_sg failed" because > you have not 3 but 300 scsi disks connected to your system and you are > writing to all them at the same time allocating zillons of pte, and one > of your drivers (possibly not even a storage driver) is actually not > checking the reval of the pci_map_* functions. You don't need a pte > memleak to trigger it, even regardless of the fact I grown the dynamic > window to 1G which makes it 8 times harder to trigger than in mainline.
I think you're too pessimistic. Don't mix "disks" and "controllers" -- SCSI adapter with 10 drives attached is a single DMA agent, not 10 agents.
If you're so concerned about Big Iron, go ahead and implement 64-bit PCI support, it would be right long-term solution. I'm pretty sure that high-end servers use mostly this kind of hardware.
Oh, well. This doesn't mean that I'm disagreed with what you said. :-) Driver writers must realize that pci mappings are limited resources.
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