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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 24 Dec 2020
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      Huh. So apparently SteamVR for Windows Mixed Reality crashes when you turn on the controllers... if you're running in a VM with a certain CPU configuration? This sounds like one bizarre heck of a bug.

      3 replies 5 retweets 37 likes
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    2. Hector Martin‏ @marcan42 24 Dec 2020
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      I'm running it on my TR box with GPU passthrough, and I ended up opening a ticket with support because it just looked like a random crash unrelated to the VM. But then on a hunch I changed my CPU topology and RAM and that... fixed it?

      1 reply 1 retweet 5 likes
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    3. Hector Martin‏ @marcan42 24 Dec 2020
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      I haven't bisected it yet, but I went from 1s8c16t 32G unpinned to 1s8c8t 16G properly NUMA pinned and cores pinned to 8 physical cores on the die the GPU is attached to. But, like, all of this should be a performance thing only?

      3 replies 0 retweets 8 likes
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    4. Hector Martin‏ @marcan42 24 Dec 2020
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      Or is there some nontransparent stuff about hyperthreads that can crash software when they aren't where the OS thinks they should be?

      1 reply 0 retweets 5 likes
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    5. Hector Martin‏ @marcan42 24 Dec 2020
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      The crash is just inside the SteamVR WMR driver DLL... 🤷‍♂️

      1 reply 0 retweets 6 likes
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    6. Hector Martin‏ @marcan42 24 Dec 2020
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      Anyway, >400 combo on Beat Saber says this VR gaming in a VM idea works perfectly fine, once it works.

      2 replies 0 retweets 18 likes
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    7. Sifi‏ @Sifiro 24 Dec 2020
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      Replying to @marcan42

      I usually Code/Play VR Games with a Rift S in a Virtual Machine since a Year without much hassle. (Technically since I Bought It), The unique issue was by default, the CPU identify as itself as a EPYC Processor (Because QEMU Profiles), and Oculus has an compatibliltylist which+

      1 reply 0 retweets 0 likes
    8. Sifi‏ @Sifiro 24 Dec 2020
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      Replying to @Sifiro @marcan42

      Doesn’t include EPYC CPUs (because Obvious reasons) and shows some warning Messages, which there are some workarounds but easier method (for me) is force copy CPU real Info from QEMU/KVM. (My case because it’s a Ryzen)

      1 reply 0 retweets 1 like
      Hector Martin‏ @marcan42 24 Dec 2020
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      Replying to @Sifiro

      Mine identifies as EPYC before and after the fix, so that wasn't the issue for me.

      1:21 AM - 24 Dec 2020
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      • Sifi
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