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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
      • 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.

      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. Adam [he/him]‏ @adammw 24 Dec 2020
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      Replying to @marcan42

      I wouldn't be surprised if unpinned exposes GPU driver bugs.. but then I don't really know how all that NUMA stuff works anyway

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 24 Dec 2020
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      Replying to @adammw

      Yeah but it's crashing in the *controller* code of all places?

      12:34 AM - 24 Dec 2020
      1 reply 0 retweets 0 likes
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        2. Adam [he/him]‏ @adammw 24 Dec 2020
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          Replying to @marcan42

          Usb or Bluetooth? Could it be a buggy VM implementation of Bluetooth passthrough?

          1 reply 0 retweets 0 likes
        3. Hector Martin‏ @marcan42 24 Dec 2020
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          Replying to @adammw

          I'm passing through the entire USB controller at the PCI level (I know full well USB passthrough sucks; I wrote the qemu xHCI code and that worked well but not perfectly, and that was before they redid the way passthrough works :P)

          1 reply 0 retweets 1 like
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