This is Nvidia. It'll be open source only after competitors surpass them in every metric, the technology is no longer used, and only 5 people are left who care.
Decided to benchmark with my system quickly just to get some idea of performance, have a 4070ti for reference. I recall dlss frame gen giving markedly improved frames in windows.
Cyberpunk 2077 @3440x1440, Ultra + Raytracing on with ray traced lighting at ultra, no pathtracing. DLSS and FSR set to quality. All of these are just averages, nothing was really wild with minimum fps or anything.
DLSS only ~53 fps
DLSS + DLSS Frame Gen ~78 fps
DLSS + DLSS Frame Gen + DLSS Ray Reconstruction ~77 fps
AMD fsr 3 only ~48 fps
AMD fsr 3 + FSR Frame Gen ~94 fps
AMD fsr 3 + DLSS Frame Gen ~78 fps
I'm actually impressed with the performance of FSR frame gen, didn't expect it to be that much higher, could be that dlss frame gen is super new in linux? Probably not worth speculation. Also can't comment on perceived looks of them though, that's going to be super subjective.
This is all on arch with the most up to date nvidia open drivers with proton experimental.
I never directly compared the two but felt like FSR was a decent competitor. Iirc there is a comparison video made by gamers nexus on this too but it probably isnt very up to date at this point and wont be a fair representation of the current performance.