Radeon's Open-Source Linux GPU Driver Has Nearly Caught Up With Windows' Driver
With the older Unigine Tropics tech demo, the RX 580 is seeing roughly the same performance on Linux vs. Windows while the faster R9 Fury manages to even run better on Linux than Windows for this GL test case.
With Heaven at 1080p, the performance was the same under Windows and Ubuntu Linux while at 4K, Linux 4.12 + Mesa 17.2-dev was coming up a few frames short. Heaven was running in windowed mode at 1080p as when trying to run the test full-screen yielded the system losing display output with the Windows driver.