[Mesa-dev] [BUG] Large slowdown with RADV / Warcraft with latest Mesa from Git.

[Michel Dänzer]

On 2021-01-08 5:54 p.m., Chris Rankin wrote:
> Hi,
> 
> I've just noticed a large drop in FPS (from 60 down to 15) when playing World of Warcraft with the latest Mesa from Git.
> A quick git bisect has identified this commit:
> 
> 4292fb2139282e6906d4ad2a8be2fd81ed7ca8af is the first bad commit
> commit 4292fb2139282e6906d4ad2a8be2fd81ed7ca8af
> Author: Michel Dänzer <mdaenzer at redhat.com>
> Date:   Mon Dec 21 15:41:56 2020 +0100
> 
>      wsi/x11: Use PresentOptionAsync for MAILBOX present mode with Xwayland
>      
>      This allows Xwayland to forward buffers to the Wayland compositor ASAP
>      for fullscreen / undecorated windows, which in turn allows true mailbox
>      behaviour in the Wayland compositor.
>      
>      Without this, Xwayland has to emulate the mailbox behaviour itself,
>      which it cannot do as well as the Wayland compositor by design.
>      
>      Reviewed-by: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>
>      Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8197>
> 
>   src/vulkan/wsi/wsi_common_x11.c | 7 +++++++
>   1 file changed, 7 insertions(+)
> 
> I am playing WoW with this release of Wine:
> 
> wine-6.0-0.4rc4.fc33.x86_64
> 
> And this version of DXVK:
> 
> wine-dxvk-1.7.2-3.fc33.x86_64
> 
> Curiously, I am using Xorg rather than Wayland, and so don't understand why this commit should affect me.

Does the attached patch fix it?


P.S. Mesa uses GitLab issues for bug tracking now: 
https://gitlab.freedesktop.org/mesa/mesa/-/issues

-- 
Earthling Michel Dänzer               |               https://redhat.com
Libre software enthusiast             |             Mesa and X developer
-------------- next part --------------
A non-text attachment was scrubbed...
Name: wsi-initialize-is_xwayland.diff
Type: text/x-patch
Size: 562 bytes
Desc: not available
URL: <https://lists.freedesktop.org/archives/mesa-dev/attachments/20210108/e5ce7557/attachment.bin>