Running NVIDIA On GNOME's X.Org Session May Get A Lot Smoother
Written by Michael Larabel in GNOME on 2 June 2019 at 08:38 AM EDT. 63 Comments
GNOME --
Canonical's Daniel van Vugt continues doing a lot of interesting performance investigations and optimizations around improving the experience of GNOME not only for Ubuntu but the upstream components. His latest focus has been on NVIDIA enhancements and now for the X.Org session there is a merge request pending to provide for a smoother experience.

This week Van Vugt opened up a pull request that provides a "significant improvement" to the frame-rate smoothness for NVIDIA's proprietary Linux graphics driver running on GNOME under the X.Org session (this MR doesn't affect the Wayland session).

The change is dropping the threaded swap waiting used with the NVIDIA driver. "So "threaded swap wait" provided better sub-frame phase accuracy, but at the expense of frame rates. And as soon as it starts causing frame drops, that one and only benefit is lost. There is no reason to keep it."

Daniel also added, "Noticed way better responsiveness when videos are running in Chrome or CPU is running at 100% (e.g. Handbrake encoding videos). The choppiness is gone. Using a NVIDIA 1080 Ti here using 430.14 driver."


This code does depend upon Daniel's earlier patches from months ago about consolidating all the frame throttling code into clutter-stage-cogl. That prerequisite itself is a big win with addressing NVIDIA CPU usage problems as well as mouse cursor issues at 60Hz when the display's refresh rate is higher, among other benefits for that reworked code.

So let's hope that this merge request will land for the current GNOME 3.33 development cycle so that September's GNOME 3.34 will be looking good on the performance front. There's already been several optimizations merged this cycle while a lot more changes are still pending / stuck in the review queue.

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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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