In a significant development for Linux users, Intel's open-source Linux drivers for OpenGL (Iris) and Vulkan (ANV) have incorporated support for dual-SIMD8 dispatch on their Gen12 graphics architecture, starting with Tigerlake and newer versions. This update is expected to enhance ALU utilization and boost performance.

Dual-SIMD8 dispatch, a feature available on Intel graphics hardware since Tigerlake, allows for better ALU (Arithmetic Logic Unit) utilization. Francisco Jerez, a graphics driver developer at Intel, explained that the multipolygon pixel shader dispatch, supported by Tigerlake and later hardware, can potentially offer improved ALU utilization in scenarios involving a large number of small polygons that cannot efficiently utilize the ALUs under the SIMD16 dispatch mode.

While this addition to Mesa 24.0 brings promising prospects, it is important to note that dual-SIMD8 dispatch is not enabled by default in this version. The Intel team plans to conduct further performance testing and evaluation before enabling it as the default setting. For users who are eager to experiment with this feature, it can be manually enabled via the INTEL_SIMD_DEBUG=fs2x8 environment variable.

Jerez highlighted that the immediate objective of this update is to prepare the compiler for the additional multipolygon modes available on Gfx20+. These new modes, expected to yield even greater benefits from multipolygon dispatch, leverage the doubled ALU vector width and offer a wider range of multipolygon dispatch modes.

Intel's Mesa drivers are integral to delivering optimal graphics performance for Linux users. The support for dual-SIMD8 dispatch in Mesa 24.0, set to release as a stable version in mid-Q1, opens up new possibilities for improved ALU utilization. Users with recent Intel integrated or discrete graphics hardware can experiment with dual-SIMD8 dispatch by utilizing the INTEL_SIMD_DEBUG=fs2x8 environment variable.

This update also brings attention to the doubled ALU vector width and larger dispatch modes available for Intel Xe2 graphics. As these advancements become more apparent, users can expect further improvements in performance for Intel's graphics hardware.

With the integration of dual-SIMD8 dispatch support, Intel continues to invest in optimizing their Linux drivers, providing an enhanced graphics experience for Linux users on Intel hardware.

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