| Bug ID | 107939 |
|---|---|
| Summary | Commit 888b7fc causes performance regression |
| Product | Mesa |
| Version | 18.1 |
| Hardware | x86-64 (AMD64) |
| OS | Linux (All) |
| Status | NEW |
| Severity | normal |
| Priority | medium |
| Component | Drivers/Gallium/radeonsi |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | david@lunarg.com |
| QA Contact | dri-devel@lists.freedesktop.org |
Our Vulkan regression test suite includes a Vulkan trace of the Sasha Willems shadowmapping demo. We found that the fps when playing back that trace file had decreased by about 20%. I narrowed down the performance drop to commit 888b7fc. I duplicated the performance drop with the demo itself. Without commit 888b7fc, the demo runs at an average of 3125 fps. With commit 888b7fc, it runs at 2675 fps. This is a performance regression of about 14%. I ran this on a system with an Intel i5-6600K CPU @ 3.50GHz and an AMD Radeon RX470 graphics card.
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