Messages in this thread |  | | Date | Mon, 21 May 2001 12:50:32 +0200 | From | Andrea Arcangeli <> | Subject | Re: alpha iommu fixes |
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On Mon, May 21, 2001 at 03:11:52AM -0700, David S. Miller wrote: > I think such designs which gobble up a gig or so of DMA mappings on
they maps something like 200mbyte I think. I also seen other cards doing the same kind of stuff again for the distributed computing.
> to be using dual address cycles, ie. 64-bit PCI addressing. It is > the same response you would give to someone trying to obtain 3 or more > gigabytes of user address space in a process on x86, right? You might
I never seen those running on 64bit boxes even if they are supposed to run there too.
Here it's a little different, 32bit virtual address space limitation isn't always a showstopper for those kind of CPU intensive apps (they don't need huge caches).
> respond to that person "What you really need is x86-64." for example > :-)
for the 32bit virtual address space issues of course yes ;)
> To me, from this perspective, the Quadrics sounds instead like a very > broken piece of hardware. And in any event, is there even a Quadrics
they're not the only ones doing that, I seen others doing that kind of stuff, it's just a matter of information memory fast across a cluster, if you delegate that work to a separate engine (btw they runs a sparc32bit cpu, also guess why they aren't pci64) you can spend much more cpu cycles of the main CPU on the userspace computations.
> driver for sparc64? :-) (I'm a free software old-fart, so please > excuse my immediate association between "high end" and "proprietary" > :-)
:)
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