https://bugs.freedesktop.org/show_bug.cgi?id=101278
Bug ID: 101278 Summary: Severe slowdown on Shadow of Mordor between 17.1.0 and 17.1.1 Product: Mesa Version: 17.1 Hardware: x86-64 (AMD64) OS: Linux (All) Status: NEW Severity: normal Priority: medium Component: Drivers/Gallium/radeonsi Assignee: dri-devel@lists.freedesktop.org Reporter: nagrigoriadis@gmail.com QA Contact: dri-devel@lists.freedesktop.org
Shadow of Mordor slowed down significantly for me on my notebook between Mesa 17.1.0 and 17.1.1
My system: Gentoo Linux 64-bit Dell Precision M4700 Intel i7-3720QM quad-core 16 Gig RAM AMD FirePro M4000 (Cape Verde, 512su, 1GB DDR5 RAM, 675Mhz)
I then did a bisect to find the commit where the slowdown happened (used the built-in benchmark tool manually, some custom medium-low settings): 35ec26bb00536639b9571f31d8e3f2bcbcfc32fb 30.31fps ad3b5b7f5f7590fd4359ea3483e2309e4cebc472 18.12fps
So the commit that causes the big slowdown: https://cgit.freedesktop.org/mesa/mesa/commit/?h=17.1&id=ad3b5b7f5f7590f... seems to be specific to SI, but appears to fix an issue in tessellation. I double-checked, and tessellation is off in the game settings, so I'm surprised this caused a performance difference.