Messages in this thread | | | Date | Mon, 17 Oct 2005 09:02:57 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: x86_64: 2.6.14-rc4 swiotlb broken |
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On Mon, 17 Oct 2005, Andi Kleen wrote:
> On Monday 17 October 2005 17:27, Linus Torvalds wrote: > > On Mon, 17 Oct 2005, Andi Kleen wrote: > > > The patch is actually not quite correct - in theory node 0 could be too > > > small to contain the full swiotlb bounce buffers. > > > > Is node 0 guaranteed to be all low-memory? What if it allocates stuff at > > the end of memory on NODE(0)? > > This is 64bit ... only low memory.
Ehh.. No there isn't.
PCI DMA isn't magically 64-bit, even on your Opteron.
So low memory in this case is anything < 32 bits. How many bits the CPU has is immaterial.
That's the whole _point_ of swtlb, after all, so I don't see why you argue.
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