Panfrost Making Use Of The Gallium3D I/O Vectorization For Better Performance
Written by Michael Larabel in Mesa on 9 June 2019 at 12:43 AM EDT. 7 Comments
MESA --
At the end of May I wrote about Intel's Iris Gallium3D driver achieving performance optimizations with new NIR I/O vectorization functionality. The open-source Arm Mali "Panfrost" Gallium3D driver has now wired into this code too for better performance.

The Intel Iris gains with this I/O vectorization were 1~9% with Skylake GT4e graphics. Thanks to this code being implemented in the Mesa NIR state tracker, it's just left up to the Gallium3D drivers to do a bit more for this vectorization pass after other optimizations are complete.

Lead Panfrost driver developer, Alyssa Rosenzweig - who just joined Collabora - wired in this I/O vectorization support for Panfrost.

She wrote, "This uses the new mesa/st functionality for NIR I/O vectorization, which eliminates a number of corner cases (resulting in assorted dEQP failures and regressions) and should improve performance substantial due to lessened pressure on the load/store pipe."

This functionality is in Git for Mesa 19.2.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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