Solid and Wireframe viewport performance hit on AMD Radeon GPUs #84277

New Issue

Rob Williams · 2020-12-30T19:48:18+01:00

Rob Williams commented

2020-12-30 19:48:18 +01:00

System Information
Operating system: Windows 10 (20H2), Linux (Ubuntu 20.04 5.4.0-58-generic)
Graphics card: AMD Radeon (including, at least: RX 5500, RX 5600, RX 5700, RX 5700 XT, RX 6800, RX 6800 XT, and RX 6900 XT)

Blender Version
Broken: 2.91.0+
Worked: 2.90.1

Caused by 38ef35b1ed

Short description of error
With the launch of Blender 2.91, AMD Radeon GPUs suffer a performance hit in Solid and Wireframe viewport modes.

Windows test using Radeon RX 6900 XT w/ Radeon Adrenalin 20.12.2 driver and the 2.77 'Racing Car' project:

	LookDev	Solid	Wireframe
2.90.1	~17 FPS	~85 FPS	~70 FPS
2.91.0	~17 FPS	~67 FPS	~35 FPS
2.92.0 `c1740e9ad0`	~17 FPS	~65 FPS	~35 FPS

Linux test using Radeon RX 6900 XT w/ Radeon Adrenalin 20.45 driver and the 2.77 'Racing Car' project:

	LookDev	Solid	Wireframe
2.90.1	~18 FPS	~90 FPS	~90 FPS
2.91.0	~18 FPS	~70 FPS	~58 FPS

This degradation has been witnessed on both AMD Ryzen Threadripper (TRX40) and AMD Ryzen (AM4) platforms. NVIDIA doesn't seem impacted.

Side-by-side example (2.90 on left; 2.91 on right):

More context with other GPUs included:

Please ignore the odd NVIDIA scaling that's seen here, as the test method needs improving (I haven't used my automated wireframe performance data until now), but the greatly impacted AMD performance is easy to see. As noted above, this performance issue does not occur in the previous 2.90 release. In 2.90, AMD might still underperform compared to my expectations, but Solid and Wireframe modes are notably smoother there than in 2.91.

The same issue seen in Ubuntu:

Performance in Linux seems better out-of-the-gate, so the performance detriment by moving to 2.91 isn't nearly as obvious.

Exact steps for others to reproduce the error
Using an AMD Radeon graphics card with up-to-date drivers,

run Blender 2.90 and 2.91 side-by-side, and open the same project.
Enable wireframe mode in each ({key shift Z}),
using the mouse or holding num6 to rotate the camera in both clients should make the performance drop obvious.
Using an FPS overlay (eg: Fraps, MangoHud) will make it easier to quantify.

(Project: https://download.blender.org/demo/test/splash-pokedstudio.blend.zip)

**System Information** Operating system: Windows 10 (20H2), Linux (Ubuntu 20.04 5.4.0-58-generic) Graphics card: AMD Radeon (including, at least: RX 5500, RX 5600, RX 5700, RX 5700 XT, RX 6800, RX 6800 XT, and RX 6900 XT) **Blender Version** Broken: 2.91.0+ Worked: 2.90.1 Caused by 38ef35b1ed **Short description of error** With the launch of Blender 2.91, AMD Radeon GPUs suffer a performance hit in Solid and Wireframe viewport modes. Windows test using Radeon RX 6900 XT w/ Radeon Adrenalin 20.12.2 driver and the 2.77 'Racing Car' project: ||LookDev|Solid|Wireframe | -- | -- | -- | -- | |**2.90.1**|~17 FPS|~85 FPS|~70 FPS |**2.91.0**|~17 FPS|~67 FPS|~35 FPS |**2.92.0 c1740e9ad02d**|~17 FPS|~65 FPS|~35 FPS Linux test using Radeon RX 6900 XT w/ Radeon Adrenalin 20.45 driver and the 2.77 'Racing Car' project: ||LookDev|Solid|Wireframe | -- | -- | -- | -- | |**2.90.1**|~18 FPS|~90 FPS|~90 FPS |**2.91.0**|~18 FPS|~70 FPS|~58 FPS This degradation has been witnessed on both AMD Ryzen Threadripper (TRX40) and AMD Ryzen (AM4) platforms. NVIDIA doesn't seem impacted. Side-by-side example (2.90 on left; 2.91 on right): ![Blender-2.91-vs-2.90-AMD-Radeon-Viewport-Performance.jpg](https://archive.blender.org/developer/F9538689/Blender-2.91-vs-2.90-AMD-Radeon-Viewport-Performance.jpg) More context with other GPUs included: ![Blender-2.91-4K-Racing-Car-Wireframe-Viewport-Performance-December-2020.jpg](https://archive.blender.org/developer/F9538691/Blender-2.91-4K-Racing-Car-Wireframe-Viewport-Performance-December-2020.jpg) ![Blender-2.91-4K-Controller-Wireframe-Viewport-Performance-December-2020.jpg](https://archive.blender.org/developer/F9538693/Blender-2.91-4K-Controller-Wireframe-Viewport-Performance-December-2020.jpg) Please ignore the odd NVIDIA scaling that's seen here, as the test method needs improving (I haven't used my automated wireframe performance data until now), but the greatly impacted AMD performance is easy to see. As noted above, this performance issue does not occur in the previous 2.90 release. In 2.90, AMD might still underperform compared to my expectations, but Solid and Wireframe modes are notably smoother there than in 2.91. The same issue seen in Ubuntu: ![Blender_Viewport_Ubuntu_Radeon_RX_6900_XT.jpg](https://archive.blender.org/developer/F9551627/Blender_Viewport_Ubuntu_Radeon_RX_6900_XT.jpg) Performance in Linux seems better out-of-the-gate, so the performance detriment by moving to 2.91 isn't nearly as obvious. **Exact steps for others to reproduce the error** Using an AMD Radeon graphics card with up-to-date drivers, - run Blender 2.90 and 2.91 side-by-side, and open the same project. - Enable wireframe mode in each ({key shift Z}), - using the mouse or holding num6 to rotate the camera in both clients should make the performance drop obvious. Using an FPS overlay (eg: Fraps, MangoHud) will make it easier to quantify. (Project: https://download.blender.org/demo/test/splash-pokedstudio.blend.zip)

Rob Williams commented

2020-12-30 19:48:18 +01:00

Added subscriber: @Deathspawner

Andrea Monzini commented

2020-12-30 22:19:14 +01:00

Added subscriber: @AndreaMonzini

Brian Jones commented

2021-01-01 06:22:28 +01:00

Added subscriber: @bdjones

Germano Cavalcante commented

2021-01-04 15:34:46 +01:00

Added subscribers: @fclem, @mano-wii

Germano Cavalcante commented

2021-01-04 15:34:46 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Germano Cavalcante commented

2021-01-04 15:34:46 +01:00

Nice catch. Thanks for the report.
I can confirm a reduction in the fps of the animation in wireframe of this file (from 30fps to 14fps) apparently due to 38ef35b1ed

Nice catch. Thanks for the report. I can confirm a reduction in the fps of the animation in wireframe of this file (from 30fps to 14fps) apparently due to 38ef35b1ed

blender-admin commented

2021-02-01 13:40:57 +01:00

This issue was referenced by 03c1c5f3a4

This issue was referenced by 03c1c5f3a4c58e9f85a9ae79010a4fd41c8af92c

Clément Foucault commented

2021-02-01 13:41:23 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Clément Foucault closed this issue

2021-02-01 13:41:23 +01:00

Clément Foucault self-assigned this 2021-02-01 13:41:23 +01:00

Thomas Dinges added this to the 2.92 milestone 2023-02-08 16:15:35 +01:00

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Solid and Wireframe viewport performance hit on AMD Radeon GPUs #84277