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xen-devel
Re: [Xen-devel] Xen 4.0.1 "xc_map_foreign_batch: mmap failed: Cannot a
On Wed, 5 Jan 2011, Jan Beulich wrote:
> But this means it can have very close to the total amount of
> memory the guest has in flight on its own. Clearly this should
> be throttled based on available memory (just consider you have
> multiple such I/O hungry guests).
This is true in theory, but Qemu emulates a PIIX3 chipset that only has
two dma engines so I don't believe is possible to have more than 2 dma
requests in flight.
However I am not sure what is the maximum size for a single dma request.
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