| Bug ID | 108330 |
|---|---|
| Summary | WarThunder game performance killed after Ryzen optimisations |
| Product | Mesa |
| Version | git |
| Hardware | x86-64 (AMD64) |
| OS | Linux (All) |
| Status | NEW |
| Severity | normal |
| Priority | medium |
| Component | Drivers/Gallium/radeonsi |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | acelists@atlas.sk |
| QA Contact | dri-devel@lists.freedesktop.org |
After the recent optimisation of radeonsi for Ryzen CPUs (apparently change in thread management distributing them to CPU cores), the performance of the WarThunder game dived radically. Normally it was 40-60FPS. After the change it appears OK when in plain fields, but when moving the vehicle into a more intensive area, where shots are fired or other player vehicles are around, the FPS drops to 0-10 with really noticeable freezes and stuttering. This was never the case before the change, The GPU is Radeon RX 560 (4GB memory). The CPU is AMD Threadripper 1920x (12 cores/24 threads) so it may be one where the optimisations are applied. Are Threadripper CCX/core layout properly recognized by the patch for Ryzen? Before the patch I noticed, the speed of the game can be visibly negatively affected if other tasks are running on the CPU. So I always run the game with no other CPU heavy tasks running. The report is also with no other tasks. It may be the change of thread scheduling from the patch has now invoked the core/thread load scenario the game is sensitive to. I run Mesa from git so I noticed this problem when it was merged. Now running on Mesa 18.2.2 stable and the problem is not there.
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