| Headlines |
| 2024-01-13 |
Fedora Asahi Linux remix improves energy savings |
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The Asahi Linux project is working with Fedora to develop a Linux distribution that runs on Apple M-series computers. The project has made progress on many fronts, improving the day-to-day usability of the distribution. One area where the project has made progress is with energy savings: "While working on speaker support, we found that Pipewire and Wireplumber were constantly being mis-scheduled onto P-cores. By default, the kernel prioritizes never being “late” above everything else for real-time threads, thus audio processing, due to its real-time nature, was always being given full performance. We did the math, and we found we don’t need anywhere near full performance to run our DSP code. To fix this, we gave Pipewire and Wireplumber the ability to use utilisation clamping, a scheduler feature that lets applications peg their performance requirements to a fixed range. We cap Pipewire and Wireplumber to an extremely low maximum performance so the scheduler restricts them to efficiency cores at their lowest operating point. Both still function perfectly, and we get to save oodles of battery life for our users! This awesome feature goes so underutilised that it wasn’t even enabled in the standard Fedora kernel until we asked for it to be a couple of weeks ago (CONFIG_UCLAMP_TASK), and we sincerely hope that its enablement in Fedora leads to more widespread adoption." Additional updates are provided in the Asahi Linux blog post. |
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