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CS Memory Accounting For Radeon Gallium3D

AMD

Published on 31 January 2013 03:00 PM EST
Written by Michael Larabel in AMD
6 Comments

With the Radeon Gallium3D driver (and Mesa/Gallum3D drivers in generally) finally moving on to properly handling more visually demanding and modern OpenGL games and other workloads, it's time for CS memory accounting to be implemented within the open-source driver.

Jerome Glisse implemented support today in R600g for basic CS memory usage accounting, per this commit. The memory usage accounting basically comes down to making sure what's submitted to the GPU doesn't end up going over the video RAM and GTT size. Right now the check is seeing that the submission doesn't go over 70% the GTT+vRAM size to allow for some memory fragmentation.

The commit description explains, " The idea is to compute a gross estimate of memory requirement of each draw call. After each draw call, memory will be precisely accounted. So the uncertainty is only on the current draw call. In practice this gave very good estimate (+/- 10% of the target memory limit)."

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
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