‹ BackHN Continuity

Thread

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. Moto7451 · · focus · HN ↗
          I think you’re experiencing paging to main memory rather than anything ReBAR related. ReBAR itself reduces memory copy operations. It’s of course possible you’re experiencing some sort of BIOS bug.
Open on Hacker News to reply ↗

Unofficial Hacker News client; not affiliated with Y Combinator.