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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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    Hector Martin‏ @marcan42 24 Dec 2020
    • Report Tweet
    • Report NetzDG Violation

    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.

    12:19 AM - 24 Dec 2020
    • 5 Retweets
    • 37 Likes
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    3 replies 5 retweets 37 likes
      1. New conversation
      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. End of conversation
      1. Steven Bock‏ @dabockster 24 Dec 2020
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        Replying to @marcan42

        The VM alone makes me suspect DRM or some sort of anticheat.

        0 replies 0 retweets 0 likes
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      2. Vivi  ✊🏿 🇭🇰 🏳️‍🌈‏ @vivithecanine 25 Dec 2020
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        Replying to @marcan42

        would you mind sharing the secret sauce that makes this configuration work? (presumably qemu command line)

        1 reply 0 retweets 0 likes
      3. Hector Martin‏ @marcan42 25 Dec 2020
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        Replying to @vivithecanine

        Here is the libvirt config: https://mrcn.st/p/NwNat7sM  This is a Threadripper 1950X with the memory in channel interleave mode (so proper NUMA exposed to the OS). The VM runs on node 0, which is attached to the big GPU. Using a recent nightly OVMF firmware.

        0 replies 0 retweets 1 like
      4. End of conversation

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