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ReBarUEFI: Resizable BAR for almost any UEFI system

243 points · 77 comments · nateb2022

  1. bigwheels · · focus · HN ↗
    What does this do? I perused the README but I'm still clueless on what the purpose and use-case is for ReBAR.

    (Posting this under the assumption others will also appreciate a bit of quick context.)

    1. wmf · · focus · HN ↗
      It allows the CPU to access all GPU VRAM. This improves gaming performance, especially for AMD GPUs.
      1. willis936 · · focus · HN ↗
        It should come with a warning label. If you're in a scenario where VRAM is being maxed out and thrashing main memory then ReBAR will worsen the frequency and magnitude of the stutters. I ran into this with a 3070 (8 GB) recently.
        1. jmalicki · · focus · HN ↗
          It's entirely possible a game manages paging VRAM badly. But allowing the game more flexibility isn't a problem with a larger BAR, it's that the game is stupid and gets dumber the more VRAM you give it.

          If a program runs slower when you give it more RAM, the problem isn't giving more RAM.

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