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[Xen-devel] Swiotlb

While writing a driver for a device doing lots of DMA I've hit an
"swiotlb_full()" problem.  This surprised me somewhat as I wouldn't have
expected to need the use of the software TLB - it's a 64 bit capable
device on a server with only 2 GB of RAM, and so I'd have expected to be
using a hardware TLB.  Is this a peculiarity of Xen, or should I be
right to be surprised?

I expect I can increase the size of the swiotlb to avoid this problem,
but thought I'd check that there isn't something more fundamentally
wrong first.



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