This would presumably let x86 windows games run on ARM hardware.
This is almost certainly meant for the next Valve VR headset, but ARM has so much better power efficiency than x86 that a future ARM based Deck would be a huge improvement to battery life.
Also see this tweet:
VR games that have already secretly pushed Android ARM builds onto the Steam Store are ran via Waydroid (androidARM to LinuxARM)
VR games that do not have an ARM build on Steam (windows x86) are being translated/emulated via ProtonARM and FEX
Edit: here’s gamingonlinux coverage of this info, includes some more information
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Well, Steam and Proton both already run on top of FEX or Box64 on ARM Linux, but it’s nice to see an official effort from Valve.
Also, does ARM still have better battery life when all of the machine code has to be translated from x86? That adds a not insubstantial amount of CPU overhead, which does hurt battery life.
And perhaps most importantly, is there any ARM chipset out there that can deliver performance on par with the Steam Deck’s CPU (even after factoring in the overhead of the x86 JIT) at a viable price for a Steam Deck successor?
Also, does ARM still have better battery life when all of the machine code has to be translated from x86? That adds a not insubstantial amount of CPU overhead, which does hurt battery life.
No idea, and that’s a pretty good question. The again some games run better on proton through Linux than they do on windows, so the performance overhead isn’t that bad.
True, but I feel like having to reroute x86 calls to ARM will produce more overhead than just Proton.
Depends on how it’s implemented. If they have a version of Proton that translates all x86 windows syscalls to ARM Linux, some operations could be extremely efficient.
There’s definitely got to be more overhead overall, though. Especially for devices with memory page sizes other than 4K, like the M-series Apple chips do (they use 16K as their page size), likely a VM will need to be sandwiched in there to ensure memory alignment. It’ll more fully be emulation and not just translation.
does ARM still have better battery life when all of the machine code has to be translated from x86
afaik macos/rosetta is more efficient than native windows/x86, but that could be down to OS integration, or any number of confounding factors… i’d suggest though that x86 windows applications sometimes run better and more efficiently on alternative platforms, even with the translation layers - whether that’s down to the instruction set or a combination of factors
This is almost certainly meant for the next Valve VR headset
Based on what? Looks more likely to be Android to me. Or it could be an ARM Steam Deck.
ARM has so much better power efficiency than x86
x86 has pretty much caught up already if you look at the latest mobile chips from AMD and Intel.
Part of how they’re identifying that proton arm and steam Waydroid exists is that the tools are being used to test VR games uploaded to steam, or were uploaded in a batch of other VR assets.
I fully hope to see this apply to Steam Deck/Chromebooks/Android/etc, but right now any hints of these have been VR specific. We haven’t seen the Proton ARM before, but previous leaks about Waydroid have also all been VR related.
Steam for Android ready to play my PC games from my phone sounds awesome, not gonna lie.
I mean… It mentions waydroid so it is probably going to use that for android compatibility…
Imagine someone can game on their Mac using ashi linux or heck even your phone
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yeah true i dont rlly have a mac but imagine gaming on apples m4 chips
A part of me does hope that they’ll hold off and release riscv products instead (headset and deck). I know box64 can already translate to riscv and I remember reading that FEX was working on it (android is also getting riscv support so waydroid should too?). Given their focus on linux it has to be on their radar
In the shorter-term the issue is the lack of sufficiently powerful commercially-available RISC-V hardware for the level of gaming people expect out of a Steam Deck or VR headset, which ARM already has a number of SOCs capable of.
I don’t doubt that the work will continue but Valve isn’t likely to pour time or money into it until they think the hardware is there.
i mean better efficiency is one thing, but having “so much better power efficiency” isn’t that large, especially under load. Arms major advantage is efficiency while doing lighter workloads, which is kinda the antithesis of a gaming device would be.
What arm based designs excel at is if whatever workload utilizes some of the specific built hardware in them, which is why the modems and camera image processor on the snapdragon cpus are better than x86, because x86 designs dont really have dedicated hardware for those functions integrated fully(intel cpus do to some extent)
Arms major advantage is efficiency while doing lighter workloads, which is kinda the antithesis of a gaming device would be.
That’s important too for gaming devices. It’s great the the steam deck can get 6-8 hours on low power games like Stardew Valley. A significant problem with many of the windows competitors is that they don’t see significantly better battery life at low loads. The original ROG Ally gets about 1.5 hours in a game like Cyberpunk 2077, but only gets 2-2.5 hours in a game like Stardew Valley.
the lighter workloads isn’t like stardew valley levels workloads, it would be like watching a video level loads. Just being arm doesn’t outright make it that battery friendly, its like the non application use(e.g sleep, super basic app) where the battery level is better. The qualcomm laptop reviews kind of show that platform when its battery life is mildly better than last gen amd/intel chips and worse under gaming. Qualcomm rushed the release because they new they needed to release before AMD’s Strix Point and Intels Lunar Lake to make it look like they were more efficient. (X elite was on TSMC N4, Meteor lake was on N5/N6, Phoenix and Strix were on N4X, but they knew AMD would have the highest NPU performance had it released first.
the BIGGEST flaw that the arm based designs have that isn’t tegra is that their graphics drivers are inferior to both Nvidia and AMD, and graphics drivers play a huge role in whether something works correctly or not.
ARM based Deck would be a huge improvement to battery life. Don’t get your hopes up too high. You will need an emulation layer like FEX of Box64, and unlike WINE those do have quite a substantial overhead.
It is impressive how far those emulators have come, especially since they got the option to use native libraries instead of emulated ones, but the game logic itself will always need emulation…
This doesn’t mean it can’t be done, it just means that the ARM CPU needs to be pretty fast to counter the emulation overhead, and that’s why I have my doubts about the energy efficiency…
(Btw: I have tried running several AMD64 games on my A311D powered MNT Reform laptop with Box64. It’s impressive how well the emulation runs, and how many games are actually playable already. However, I also encountered a lot of games that don’t reach enjoyable FPS on that hardware. With a faster ARM chip though…)
With a big dev like valve backing it they could probably implement a pretty impressive JIT/cacheing scheme - of course nothing beats native but this gap will close over time
Yep. The big question is if the gap will close enough that ARM chips indeed end up delivering better power efficiency with emulation than an AMD64 chip that delivers the same performance without emulation.
My bets would be on the native AMD64 chip ending up more power efficient. To be honest, I would not bet too much money though.
The world is getting a better place
This would presumably let x86 windows games run on ARM hardware.
Doesn’t that require something quite different?
Proton is improved (matured?) WINE, right? And Wine Is Not an Emulator - the point being it doesn’t emulate hardware, it translates instruction sets. From for-Windows x86 to Linux x86. Can you do that cross cpu architecture?
I’d assume “FEX” in the last tweet in the OP is referring to this: https://github.com/FEX-Emu/FEX
Exciting! I remember commenting about the next Steam Deck being ARM a couple months ago and a few people replied that it was unlikely haha
Hope this can work in Asahi Linux at some point too 👀
This is something I’ve always wanted from them ever since I learned that the current ways that emulate x86 use proton on top of a bunch of other stuff. Would love if this was able to be used on phones.
Valve stand alone headset coming 👀
