Wich kernel version are u using?
Isn't this a duplicate of: 247148?
In the changelog of the kernel i found:
* Xen: dma: avoid unnecessarily SWIOTLB bounce buffering
- LP: #247148
I am running 2.6.24-23-xen and also HAD this issue, but when upgrading
to at least -22-xen this was resolved.
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swiotlb default size regression in hardy
https://bugs.launchpad.net/bugs/241076
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