AMDGPU Increasing Fragment Size For Performance
Written by Michael Larabel in Radeon on 19 September 2017 at 05:56 AM EDT. 8 Comments
Christian König of AMD yesterday sent out an AMDGPU kernel patch for boosting the default fragment size for GCN graphics cards pre-Vega.

The patch is quite trivial and is for boosting the default fragment size from 64KB to 2MB, similar to the move made with the latest Vega GPUs. This change is for GFX6/GFX7/GFX8 graphics processors or basically all the GCN cards prior to Vega "GFX9".

König has confirmed this should help the performance in some instances. "When you have an application which uses chunks of at least 2MB memory the gain is larger when you select 2MB then when you select 64KB in hardware. But the difference is barely measurable."

With it being too late to change for 4.14, the changeover will presumably happen with Linux 4.15.
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Michael Larabel is the principal author of 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 automated benchmarking software. He can be followed via Twitter or contacted via

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