The SteamVR Performance Test measures the system's rendering power using a two-minute sequence from a VR demo. The performance test determines whether your system can sufficiently handle VR and/or where the performance bottlenecks are of your system.
Sadly, the SteamVR Performance Test is currently available for just Windows. I haven't heard yet from any of my Valve contacts whether they plan on bringing this performance test to Linux, but hopefully they will considering the HTC Vive will be among the VR headsets supported by SteamOS / Linux. Until then, if you want to learn more about the SteamVR Performance Test, visit SteamPowered.com.