hardware scheduling

For over a decade, Windows managed graphics card operations through a single CPU thread. In May 2020, Microsoft introduced Hardware-Accelerated GPU Scheduling (HAGS), allowing users to transfer scheduling tasks to the GPU. HAGS shifts scheduling from the CPU to a dedicated processor on the GPU, reducing CPU overhead. The introduction of WDDM 3.0 with Windows 11 21H2 requires HAGS for the basic hardware flip queue, which reduces power consumption. The advanced hardware flip queue, which addresses presentation latency, also requires HAGS. With Windows 11 24H2 and WDDM 3.2, native GPU fences were introduced, allowing the GPU to manage dependencies without CPU intervention. Nvidia's frame generation features require HAGS, while Intel's Arc B-series cards do not. The state of HAGS is determined by GPU drivers, and applications like OBS have shown caution towards HAGS due to historical issues.