Bulldozer vs Motobike Kernels

Here is a comparison of our 2 rendering kernels for the interior scene from the first example. For both kernels the portals are applied for room windows. On the left image, the Bulldozer kernel executes 4 render iterations in 34 seconds while on the right image the Motobike does so in 19 seconds (1.8x faster) but with more noise.