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

Peter Zijlstra
2012-03-19T20:03:43Z

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.