It's well known in the ARM world, and it's the reason we were complaining for years about impossibility of using DMA controller from userspace to do large memcpys.
More importantly today, using DMA to do large memcpy for non-latency-sensitive tasks allows cores to sleep more often, and it's a godsend for I/O intensive stuff like modern Java apps on Android which are full of giant bitmaps.
More importantly today, using DMA to do large memcpy for non-latency-sensitive tasks allows cores to sleep more often, and it's a godsend for I/O intensive stuff like modern Java apps on Android which are full of giant bitmaps.