OpenGL vs. Vulkan Performance For Portal 2 With Radeon Linux Graphics

[gfunk]

That's weird at higher resolutions Vulkan falls off..

I tried DotA2 both OpenGL and Vulkan, Vulkan is slightly better

RX5700-XT @ 1440p

[bridgman]

That's weird at higher resolutions Vulkan falls off..

I think that makes sense - Vulkan doesn't necessarily give faster rendering when GPU-limited, but it can reduce CPU overhead and make better use of more threads/cores.

Once you get GPU-limited though, the API doesn't make as much difference.

[ermo]

Meanwhile, I think I'm going to try what it's like to play Portal 2 on an old PhII X4 955 BE w/a HD 5770 card on OpenGL @1080p.

I've (somewhat belatedly) learned that setting the CPU governor to performance helps the AMD OpenGL drivers *massively* in terms of frame rate.

Would be sweet if I could turn up the details and still run at a solid 60+ fps. Portal 2 deserves to be enjoyed on period(-ish)-correct hardware I think.

[mbrf]

It seems to me that all the OpenGL benchmarks tops off at around 600FPS, which looks like a software limitation or something (bridgman probably explained the limitations a few replies before this one), as when the hardware is pushed hard enough to drop below 600FPS, both OpenGL and and DXVK mostly has around the same FPS.

EDIT: I just saw the news about Zink.
I wonder then if Zink would be able to outperform DXVK, or match it all the way, or if the game itself is somehow limited to 600FPS, when using OpenGL.

[r1348]

I think that makes sense - Vulkan doesn't necessarily give faster rendering, but it can reduce CPU overhead and make better use of more threads/cores.

Once you get GPU-limited though, the API doesn't make as much difference.

If anything, this benchmark is good at showing which hardware will limit you at which resolution.

[theriddick]

Lots of people over on the windows echo-system are calling vulkan dead as a door-nail because of this.

And no they don't know that its DXVK and are comparing it to DX11 which it translates from and see a %10-20 reduction in performance for vulkan, thus claim its a dead api...

I do try to explain whats going on but you know how yt comments are, just a dark void everyone screams into most the time..

[Brisse]

Lots of people over on the windows echo-system are calling vulkan dead as a door-nail because of this.

And no they don't know that its DXVK and are comparing it to DX11 which it translates from and see a %10-20 reduction in performance for vulkan, thus claim its a dead api...

I do try to explain whats going on but you know how yt comments are, just a dark void everyone screams into most the time..

Lol, just let them be. Ignorance is bliss.

[MrCooper]

While most users with a high end video card won't see a ton of benefit from this I imagine users on Intel graphics or using an APU probably will.

Integrated graphics setups are generally GPU limited, but as these numbers confirm once again, Vulkan mostly makes a difference in CPU limited scenarios.

[philips]

Sick. Are there many games making use of the library?

All the Metro games on Stadia and the upcoming Metro Exodus on Steam.

[Calinou]

Almost a thousand frames per second in some cases. Pretty sick. Try libstrangle, or v-sync

Source games have a `fps_max` console command you can use to limit the frame rate, so you don't need libstrangle for that.