| Bug ID | 101978 |
|---|---|
| Summary | [bisected] war thunder performance reduced by ~28% |
| Product | Mesa |
| Version | git |
| Hardware | Other |
| OS | Linux (All) |
| Status | NEW |
| Severity | normal |
| Priority | medium |
| Component | Drivers/Gallium/radeonsi |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | higuita@gmx.net |
| QA Contact | dri-devel@lists.freedesktop.org |
Since sometime i notice that war thunder is running slower on my machine using mesa-git, but as the game is always updating, i (wrongly) blamed some game update. Yet, some days ago, after a test with a steamOS, i could confirm that older mesa versions worked faster than mesa-git, with the same game version. I excluded the kernel version, so i have done a mesa bisect and found the (old) commit that made war thunder lost about 28% performance on my setup (RX480 on a A10-7850k): commit ac6007460adaf4bb21028a3281ec622d1e43df49 Author: Marek Olšák <marek.olsak@amd.com> Date: Wed Feb 15 19:50:15 2017 +0100 radeonsi: upload constants into VRAM instead of GTT This lowers lgkm wait cycles by 30% on VI and normal conditions. The might be a measurable improvement when CE is disabled (radeon) or under L2 thrashing. I'm running slackware64 -current, with kernel 4.12.1, LLVM 4.0.1 and the game is free, so you can test it. For the bisect i started the game, run the CPU benchmark (as workaround some bug where most first benchmarks are slower) and then run the "still scene" benchmark. as is the shorter one, but all others had performance drop.
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