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We have heard from lots of different people about the difference in performance between Windows and Linux, next up is Alien: Isolation.

Note: This is not our video, just highlighting a good one like we do now and then, all credit to them. If you want a video highlighted, email it in any time, we love to see stuff like this.

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Feral Interactive ported Alien: Isolation to Linux, and it was released on 27th October 2015 for us.

What are your thoughts? Article taken from GamingOnLinux.com.
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ziabice Nov 18, 2015
It's a very interesting video.
I haven't checked very well, but judging by the FPS the game is slower under Linux: NVidia is 30% slower and AMD 50%.
Overall visual quality seems very close to me on every platform/card.
nattydread Nov 18, 2015
is it a native build or a port?
leillo1975 Nov 18, 2015
The game is perfectly playable with this FPS, but the difference is very big. VULKAN!!!!! WHERE ARE YOU!!!!!
aristorias Nov 18, 2015
What GPUs, what driver, why Ubuntu for AMD and why SteamOS for nVidia.
Whoever did this should be ashamed that these questions rise and stay unanswered.
What a pointless waste of time and effort.
lvlark Nov 18, 2015
I have 3 thoughts:
1. Performance is about where I'd expect it, NVidia SteamOS is quite decent, while not running the latest drivers.
2. I should get this game.
3. I should first get better hardware.
Liam Dawe Nov 18, 2015
is it a native build or a port?

It was ported by Feral Interactive, and it is native. A port doesn't make something not native.
Liam Dawe Nov 18, 2015
What GPUs, what driver, why Ubuntu for AMD and why SteamOS for nVidia.
Whoever did this should be ashamed that these questions rise and stay unanswered.
What a pointless waste of time and effort.

They are at the very start of the video, try watching it.
Apopas Nov 18, 2015
It happens with this specific game.
Linux and windows come head to head when it has to do with NVidia.
http://www.phoronix.com/scan.php?page=article&item=nvidia-win10-ubuntu15&num=1
http://www.phoronix.com/scan.php?page=article&item=steamos-ubuntu-faster&num=1
nattydread Nov 18, 2015
is it a native build or a port?

It was ported by Feral Interactive, and it is native. A port doesn't make something not native.

well what I mean perhaps is: does it use a wrapper to DirectX or does it directly use OpenGL? There must be some reason it doesn't perform as well on SteamOS.


Last edited by nattydread on 18 November 2015 at 12:09 pm UTC
dubigrasu Nov 18, 2015
What GPUs, what driver, why Ubuntu for AMD and why SteamOS for nVidia.
Whoever did this should be ashamed that these questions rise and stay unanswered.
What a pointless waste of time and effort.
Apart from the video where the specs are listed, a bunch of additional details are given in the description.
melkemind Nov 18, 2015
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We all know third-party ports of DirectX games to OpenGL are going to have decreased performance. This has been true in every port I've seen. It might be different when it comes to porting DirectX 12 to Vulkan, but the ultimate goal, I would think, would be to have games developed with Linux in mind from the beginning. Games like that always perform very well.
sigz Nov 18, 2015
is it a native build or a port?

It was ported by Feral Interactive, and it is native. A port doesn't make something not native.

well what I mean perhaps is: does it use a wrapper to DirectX or does it directly use OpenGL? There must be some reason it doesn't perform as well on SteamOS.

Directx wrappers are obviously always less performant under linux, and opengl is also slower under linux than windows.


Last edited by sigz on 18 November 2015 at 12:35 pm UTC
nattydread Nov 18, 2015
Why is openGL slower under linux than windows?
I'm surprised by that!

Thanks for all the answers!
dubigrasu Nov 18, 2015
is it a native build or a port?

It was ported by Feral Interactive, and it is native. A port doesn't make something not native.

well what I mean perhaps is: does it use a wrapper to DirectX or does it directly use OpenGL? There must be some reason it doesn't perform as well on SteamOS.

Directx wrappers are obviously always less performant under linux, and opengl is also slower under linux than windows.
Not always:
View video on youtube.com

View video on youtube.com
Lordpkappa Nov 18, 2015
30-40% performance difference nvidia vs nvidia with different OS it's a fail, the game is perfectly playable but to sell something you nedd to build some motivation to switch.
Right now it's a question just to have it rather than how it perform... and this is a shame.
Cybolic Nov 18, 2015
Why is openGL slower under linux than windows?
I'm surprised by that!

Thanks for all the answers!
It's not, but the game-specific optimisations that are in the Windows driver are not enabled in the Linux driver.
Apart from that, depending on how the game is written, the performance will differ between Linux and Windows, sometimes better on Linux, sometimes better on Windows. Here are some recent test results as an example.


Last edited by Cybolic on 18 November 2015 at 1:16 pm UTC
Zelox Nov 18, 2015
If u got the time to manage these kind of videos in the future, I would love it ^^.
Its always intressting to compair different builds and os's.

Dunno if this is a GoL channel. Anyways I enjoyed this.
And lets hope we get vulkan soon ^^
SystemShock Nov 18, 2015
Hmmm, interesting comparison but isn't this more a comparison between OpenGl vs. D3D than StemOS(Linux) vs. Windows ?
I mean, under what API is the Windows Version running ? Has the Windows-Version an OpenGl renderer or ist it only D3D ?

Nether the less for me Feral-Interactive did a very good Job with this Port of Alien Isolation ! For me, everything running constantly over 60 Fps is a very good Result.
sigz Nov 18, 2015
Why is openGL slower under linux than windows?
I'm surprised by that!

Thanks for all the answers!
It's not, but the game-specific optimisations that are in the Windows driver are not enabled in the Linux driver.
Apart from that, depending on how the game is written, the performance will differ between Linux and Windows, sometimes better on Linux, sometimes better on Windows. Here are some recent test results as an example.

At best you will have near same fps as in windows in some cases, most of times you will get lower fps, and you will never have a 30% more fps on linux than windows.


Last edited by sigz on 18 November 2015 at 1:50 pm UTC
tuubi Nov 18, 2015
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I can't comment on SteamOS internals, but it's a source code based interface of DX, as far as I know. I don't mean they implement DX using OpenGL, but that they provide the same interfaces at a source code level, as far as the game code is concerned. It's all compiled natively in the end.
You mean Feral's using something like togl for their ports? Have they confirmed this or is this based on your own research? As Valve showed back in the day, this can work well for most dx9 level stuff at least, but some stuff in the APIs will require a lot of intermediate processing to make the interfaces "compatible". Especially if the original code gets creative with threads. This approach is valid though if they need to keep their changes separate from the original codebase for... reasons.
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