Intel Vulkan Driver Adds Support For Xe Driver's Low Latency Hint
One of the early changes merged for the in-development Mesa 26.0 is adding support to Intel's "ANV" open-source Vulkan driver for supporting the low-latency hint supported by the modern Intel Xe kernel graphics driver.
The Intel ANV driver already supported low latency hinting when using the older i915 kernel graphics driver while with the Mesa 26.0-devel code as of yesterday is similar functionality wired up when ANV is running atop the modern Xe kernel graphics driver.
The Intel kernel graphics driver low latency hinting is for a hint to the GuC micro-controller for helping to boost the GT frequency. This low-latency mode can be beneficial for GPU workloads in ensuring the GT frequency is running higher albeit with increased power consumption.
This eight month old merge request is what implemented the low-latency submission for ANV on the Xe kernel mode driver. The user-space program needs to hint that it wants the low-latency mode and going from the merge request it appears the only user setting it for now is ChromeOS with clvk for OpenCL atop Vulkan.
The Intel ANV driver already supported low latency hinting when using the older i915 kernel graphics driver while with the Mesa 26.0-devel code as of yesterday is similar functionality wired up when ANV is running atop the modern Xe kernel graphics driver.
The Intel kernel graphics driver low latency hinting is for a hint to the GuC micro-controller for helping to boost the GT frequency. This low-latency mode can be beneficial for GPU workloads in ensuring the GT frequency is running higher albeit with increased power consumption.
This eight month old merge request is what implemented the low-latency submission for ANV on the Xe kernel mode driver. The user-space program needs to hint that it wants the low-latency mode and going from the merge request it appears the only user setting it for now is ChromeOS with clvk for OpenCL atop Vulkan.