Re: "SDS ... you're going to take a performance hit"
And that only matters if you're running benchmark tests as opposed to what actually happens for I/O in the real world. Each individual I/O will be affected by this. Yes, overall throughput and IOPs will be unaffected if there is plenty of CPU overhead, but you're going to take a hit on latency. How relevant that is depends on the individual application and the effect that latency has on that application.