Intel's OpenGL Driver Gains Another Performance Optimization
Written by Michael Larabel in Mesa on 26 November 2016 at 08:45 AM EST. 2 Comments
MESA --
While we have been talking a lot lately about performance optimizations and improvements to Intel's "ANV" Vulkan Linux driver, not all focus has been lost on the i965 Mesa OpenGL driver. In fact, a lot of code landed on Friday for i965.

Enabled on Friday was fast clears for multi-LOD. That came after a number of prep commits and plumbing to the i965 driver.

The end result? A minor but noticeable improvement for relevant OpenGL test cases.
On SKL (also fast clear is used for level 0, layer 0):

Manhattan 3.0: 3.88434% +/- 0.814659%
Manhattan 3.0 off: 3.25542% +/- 0.101149%
Trex: 3.43501% +/- 0.31223%
Trex off: 4.13781% +/- 0.0993569%

ON BDW:

Manhattan 3.0: 1.37079% +/- 0.571208%
Manhattan 3.0 off: 1.74029% +/- 0.267499%
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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 20,000 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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