RADV Lands A Few More Improvements To Reduce CPU Overhead

[phoronix]

Phoronix: RADV Lands A Few More Improvements To Reduce CPU Overhead

Samuel Pitoiset of Valve's Linux graphics team has landed a few patches into Mesa 23.0 for further reducing the CPU overhead of the Vulkan driver's draw path...

https://www.phoronix.com/news/RADV-Lower-Overhead-Draw

[Danny3]

Wonderful!
Thank you very much AMD and Valve!

[spykes]

I'm curious to see how it translates into benchmarks.

[jonkoops]

I am very glad I got myself an RX 6000-series GPU, the good stuff just keeps coming. Thanks Valve and AMD!

[kozman]

This is very cool news and shows there's always more perf to be squeezed out with the right tools and approach. There's been a huge amount of beneficial Mesa work in the past 3+ months and a lot of it coming within the upcoming 23.0.0 release. Let hope it's released on time and makes it into Debian and other early 2023 distros.

[doomie]

I'm curious to see how it translates into benchmarks.

yeah didn't he recently do some benches that looked cpu constrained? 11% in any case is huge

[schmidtbag]

This is great but it's especially important for Deck users, considering the limited CPU performance.

[JellyBrain]

yeah didn't he recently do some benches that looked cpu constrained? 11% in any case is huge

I think it is just 11% reduction in overhead. The performance increase should be much more subtle.

[gentoofu]

I think it is just 11% reduction in overhead. The performance increase should be much more subtle.

The merge request says "+~11% with ./vkoverhead -test 0 -duration 15". If we use the number from Mike Blumenkrantz's README draw result as an example, +11% of 30595 for test 0... that's around 34 million draws/second vs 30.6 million.

[kiffmet]

Just to provide some context to the numbers: I get 33400-33900k draws in test 0 on a Gentoo installation that's tailored towards my CPU with mesa 22.3.2. (5900X, RX 6800XT). Kernel 6.1.2 w/ 1000hz tick, BORE scheduler and voluntary preemption.

A generic Arch installation with a Core i7 [email protected] and RX 470 manages 20000k draws calls.