Comment 52 for bug 1671360

@Eric Joslyn: you can do the same with a stable kernel from the 4.10 series, no need to be on the bleeding edge with release candidates. (I see it's been backported to 4.9 too)

The key patch you really want to get in is the one that correctly identifies the hyper-threading capabilities of the Ryzen which came in 4.10 so anything from 4.10.0 upwards should give you the full performance. More info over there: https://www.phoronix.com/scan.php?page=news_item&px=AMD-Ryzen-Newer-Kernel