| Summary: | [BDW, BSW] GLbenchmark_V3.0_gl_driver/gl_driver_offscreen/Synmark2_v6_Batch6/Batch7 show performance dropped by 5%-12% | ||
|---|---|---|---|
| Product: | Mesa | Reporter: | wendy.wang |
| Component: | Drivers/DRI/i965 | Assignee: | Kenneth Graunke <kenneth> |
| Status: | RESOLVED WONTFIX | QA Contact: | Intel 3D Bugs Mailing List <intel-3d-bugs> |
| Severity: | normal | ||
| Priority: | medium | CC: | kenneth |
| Version: | unspecified | Keywords: | bisected |
| Hardware: | Other | ||
| OS: | All | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
| Attachments: | xorg.log | ||
It's mesa regression.By bisect, shows the first bad mesa commit is c59d1b1. commit c59d1b1fd1ac5dca3b769f42fe0e42a11c10d4b8 Author: Kenneth Graunke <kenneth@whitecape.org> AuthorDate: Fri Oct 9 17:07:23 2015 -0700 Commit: Kenneth Graunke <kenneth@whitecape.org> CommitDate: Fri Dec 11 13:11:15 2015 -0800 i965: Add tessellation shader sampler support. Based on code by Chris Forbes and Fabian Bieler. Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com> I suspect the commit just caused the benchmark to do more work. Ken, is there anything to do here? The benchmark should do the same thing, but adding additional tracked state atoms increased the draw call overhead. And these are CPU overhead benchmarks. I don't think it's worth tracking as a regression. We can't exactly retract core features. We just need to optimize away draw call CPU overhead. |
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Created attachment 120536 [details] xorg.log Test environment: Failed platforms: BDW/BSW Mesa Regression: Yes, bisect is under progress Bad gfx sw stack info: Mesa: git-7752bbc Kernel: 4.4-rc4-drm-intel-nightly_ad271e_20151213+ xf83: 2.99.917-517-g6c4ffba xserver: 1.18.99.1 GLbenchmark_V3.0_gl_driver/gl_driver_offscreen/Synmark2_v6_Batch6/Batch7 show performance dropped by 5%-12% Reproduce steps: 1. cd /gfxbench3_desktop/build/linux/gfxbench_Release/mainapp 2. export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/games/OpenGL/gfxbench3_desktop/install/linux/lib 3. ./mainapp vblank_mode=0 -t gl_alu -fullscreen 1 -w 1920 -h 1080 xorg file has been attached.