Valve Developer Posts High Priority AMDGPU Scheduling Support
Written by Michael Larabel in Radeon on 28 February 2017 at 08:17 PM EST. 17 Comments
RADEON --
Valve developer Andres Rodriguez has posted a set of 22 patches for supporting high priority scheduling within the AMDGPU kernel driver.

This high priority AMDGPU scheduling work is done as part of their open-source AMD Linux GPU driver improvements for benefiting VR / SteamVR.

Back in December was when Rodriguez laid out the proposal for high priority scheduling in AMDGPU for Linux VR efforts in order to avoid motion sickness. Now he's managed to deliver on the patches for the design talked about back then.

He wrote in part via the new patch series:
This patch series introduces a mechanism that allows users with sufficient privileges to categorize their work as "high priority". A userspace app can create a high priority amdgpu context, where any work submitted to this context will receive preferential treatment over any other work.

High priority contexts will be scheduled ahead of other contexts by the sw gpu scheduler. This functionality is generic for all HW blocks.

The earliest we could see this high priority scheduling support for the AMDGPU DRM driver is Linux 4.12, so it's still a ways from benefiting open-source AMD Linux users interested in VR without potentially getting sick by less than ideal performance.
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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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