Solving interrupt latency issues on the Onda 9D4-DVH
Running Genshin on an old 9D4-DVH should be a breeze, but after two hours of play, I'd get these random hitches that made me realize how bad the shielding is on this board. The USB controller was throwing out insane DPC latency spikes up to 3.1ms, which caused the frame rate to just dip out of nowhere. I tried moving my gear to USB 2.0 ports, but the polling rate got throttled to 125Hz, which is just not an option for me. I went into Device Manager, killed three unused USB ports, and used a professional tool to reassign the IRQ interrupts for the network card and GPU. LatencyMon finally showed DPC latency under 0.7ms, and that sluggish feeling completely disappeared. I did accidentally wipe my audio driver config during the IRQ shuffle, which muted my system until I rebooted the services. Chipset temps stayed at 40℃ - 48℃ and RAM at 36℃ - 42℃. Input tests show response times are back to normal. Config backed up.
