Re: [RFC][PATCH 00/26] sched/numa

[Peter Zijlstra]

On Mon, 2012-03-19 at 14:16 +0200, Avi Kivity wrote:
> > Afaik we do not use dma engines for memory migration. 
> 
> We don't, but I think we should. 

ISTR we (the community) had this discussion once. I also seem to
remember the general consensus being that DMA engines would mostly
likely not be worth the effort, although I can't really recall the
specifics.

Esp. for 4k pages the setup of the offload will likely be more expensive
than actually doing the memcpy.
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