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GameMode is a new daemon/lib combo for Linux that will allow you to optimize your PC for gaming. It’s not magic, it won’t suddenly make your Linux games suddenly get better performance, but it’s something that can help.

You might have seen a message box pop up with some more recent Linux ports from Feral Interactive, one that tells you that your current CPU governor is not optimised—like this:

When games end up waiting on the GPU, some CPU performance governors may downclock the CPU and then up it again later, which can result in performance problems. GameMode, as it is right now, is to help you with that. Curious about it and wanting to know a little more direct from the developers, Feral agreed to answer some quick questions I had about it:

1) Can you give us a rundown on what exactly GameMode is and why Linux gamers might need it?

“GameMode is a daemon/library combo for Linux, written in C, which allows games to request that a set of optimisations be temporarily applied to the host OS. These optimisations improve the performance of the game.

To apply these optimisations, some of our games require that users manually swap the CPU governor using sudo privileged commands. We've had some feedback from people saying that they'd prefer not to have to do so much setup in order to get the best performance from their game. Further to this, some users voiced concerns about the increased energy usage that might result from leaving the CPU in a higher power usage mode.

By automatically applying these optimisations when the game is running and removing them when it isn't, GameMode saves users the trouble of having to tinker. It also ensures that the CPU is restored to a more efficient state when they've finished playing.”

2) You say it is "intended to be expanded beyond just CPU governor states", what extras did you have in mind?

“A lot of good ideas have been put forward by beta testers, including de-activating tools like f.lux, swapping KWin from OpenGL to xrender, and changing users' chat client status to "Playing X". GameMode is Open Source, so pull requests, or forks with features like these are welcome.”

3) To be clear for our readers, is this something that will ship built-in with Feral games and will users have to do any manual steps to enable it?

“GameMode won't ship with the games; since it's open source, users will need to install it themselves using the steps on GitHub. The tool will only need to be installed once, and will work with all future Linux titles released by Feral.

It will also work with previously released games, provided users adjust their launch options on Steam.”

It’s currently under a “BSD 3-Clause License (Revised)” license and you can find out more on GitHub. It’s certainly going to be interesting to see how this project evolves over time, could end up being something extremely useful. It already made its way to the AUR for Arch users.

Once you've installed it using their instructions, you can then tell any game to use it by doing this command:

LD_PRELOAD=/usr/\$LIB/libgamemodeauto.so ./game

You can also add it as a Steam launch option for each of your games like so:

LD_PRELOAD=$LD_PRELOAD:/usr/\$LIB/libgamemodeauto.so %command%

If you wish to know what current CPU governor is in use, you can run this command in terminal:

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

I actually had pre-announcement access to it and testing it has given me some good early results. Obviously this will be game and hardware dependent and yes, all tests were done over multiple runs to ensure it wasn't a fluke.

Testing it with F1 2017 for example, gave these FPS results:

That might not look like a big difference, however, behind the FPS results are the frame timings:

  Without Game Mode With Game Mode
Min Frame Time 10.32ms 10.03ms
Average Frame Time 13.31ms 11.88ms
Max Frame Time 19.36ms 16.02ms

As you can see, it has helped to reduce frame timings while increasing the overall framerate, so using GameMode (or manually using performance mode) can have an impact resulting in a smoother game. Using GameMode instead of doing it manually, does have the benefit of your CPU reverting to a more power efficient mode afterwards of course.

Testing Deus Ex: Mankind Divided was a slightly different story, as it always gave a better minimum FPS score when using GameMode, but the average and maximum showed little difference—certainly still worth it though! As for frame timings, the built-in benchmark doesn't give them.

Company of Heroes 2 is similar to Deux Ex with the benchmark mode only giving FPS scores. During my testing, both in the benchmark mode and actually playing it, the difference was noticable when using GameMode—with it being much smoother overall:

Again, to stress, your results will depend on your hardware and it's no different to manually changing your CPU governor to performance—for now (until they do more with it), although it does bring it back down to powersave or ondemand automatically which is nice.

Rise of the Tomb Raider will be the first game from Feral to have support for it integrated, so you won't need to give it any special launch options. However, you still need to install the tool yourself.

It’s great to see Feral Interactive do more open source projects, as they already have their game launcher scripts up on GitHub too.

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102 comments
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Jahimself 10 April 2018 at 11:03 am UTC
Wow! Usefull tool, I myself is not abble to create such a tool, and it was a bit annoying to run a .sh every time I wanted to play a game, and also after playing the game. Clearly good stuff.

Microsoft must be like WTF!! They have million dollars (if not billion) of ressource to make a game mode that is slower than normal mode, and a small but well trained team of porter release an open source that actually works as intended!

Thank you Feral Interactive, good job!


Last edited by Jahimself at 10 April 2018 at 11:05 am UTC
Grimfist 10 April 2018 at 11:03 am UTC
ysblokjeFor archlinux users I created some aur packages.

gamemode-git

gamemode (stable releases)

Give this man a cookie! This is the reason why I switched to an Arch-based distro.

And big thanks to Feral for continuous support of us Linux freaks!


Last edited by Grimfist at 10 April 2018 at 11:03 am UTC
Xpander 10 April 2018 at 11:08 am UTC
This is what i used so far:

Spoiler, click me
xpander@arch ~ $ cat /usr/share/polkit-1/actions/org.archlinux.pkexec.cpupower.policy <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE policyconfig PUBLIC "-//freedesktop//DTD PolicyKit Policy Configuration 1.0//EN" " http://www.freedesktop.org/standards/PolicyKit/1/policyconfig.dtd"> <policyconfig> <action id="org.archlinux.pkexec.cpupower"> <message>cpupower without super user</message> <icon_name>cpupower</icon_name> <defaults> <allow_any>yes</allow_any> <allow_inactive>yes</allow_inactive> <allow_active>yes</allow_active> </defaults> <annotate key="org.freedesktop.policykit.exec.path">/usr/bin/cpupower</annotate> <annotate key="org.freedesktop.policykit.exec.allow_gui">true</annotate> </action> </policyconfig>

and then keybinds for:

pkexec cpupower frequency-set -g performance && notify-send "Performance Mode" "Cpu clocks set to perfromance mode" -t 2000 -i messagebox_info

and pack to normal:
pkexec cpupower frequency-set -g ondemand && notify-send "Ondemand Mode" "Cpu clocks set to ondemand mode" -t 2000 -i messagebox_info
Marky 10 April 2018 at 11:15 am UTC
This is seriously cool; both in concept and to see Feral further helping the platform (with open source, no less!).
I won't be installing it yet, as I already use indicator-cpufreq to change the cpu governor. But When other improvements come I probably will give it a spin.


Last edited by Marky at 10 April 2018 at 11:20 am UTC
buenaventura 10 April 2018 at 11:15 am UTC
Cool, will definately try this out, for me, a few frames more can mean difference between playable and not, so yeah, great!
Shmerl 10 April 2018 at 11:16 am UTC
BrisseI guess this won't do much for us AMD-users since they don't usually default to "powersave"? When I used Ubuntu 17.10 I think it defaulted to "ondemand" with my Ryzen 1700X, and now I'm on Debian Sid which seems to default to "performance".

Edit: I just realized the latter could be because I run a custom kernel.

Debian testing defaults to "ondemand". I have scripts that switch it to "perforamnce" for certain games, and then back to "ondemand".
bintsmok 10 April 2018 at 11:17 am UTC
Shouldn't this kind of feature be built-in with the OS?
Shmerl 10 April 2018 at 11:18 am UTC
bintsmokShouldn't this kind of feature be built-in with the OS?

It is. Check:

cpupower help frequency-set sudo cpupower frequency-info


Last edited by Shmerl at 10 April 2018 at 11:20 am UTC. Edited 2 times.
Keyrock 10 April 2018 at 11:21 am UTC
Great stuff from Team Cheetah. There are a bunch of companies and individuals doing great work to make Linux a more gaming friendly OS, notably Valve and Feral. Keep up the great work!
sbolokanov 10 April 2018 at 11:23 am UTC
I hope it get's non-systemd variant with time.
For now we gotta use the good old terminal.
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