I'm not pessimistic, I'm fairly relaxed also with a 512Mbyte dynamic window
(that's why I did the change in first place) and I agree that it should
take care of hiding all those bugs on 99% of hardware configurations,
but OTOH I don't want things to work by luck and I'd prefer if the real
bugs gets fixed as well eventually.
> SCSI adapter with 10 drives attached is a single DMA agent, not 10 agents.
you can do simultaneous I/O to all the disks, so you will keep those dma
entries for the SG for each disk in-use at the same time.
> 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.
Certainly 64bit pci is supported but that doesn't change the fact you
can as well have 32bit devices on those boxes.
> Oh, well. This doesn't mean that I'm disagreed with what you said. :-)
> Driver writers must realize that pci mappings are limited resources.
Exactly.
Andrea
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