| Summary: | [HSW Bisected] OglDrvShComp_6 performance decreased by 10-20% due to NIR. | ||
|---|---|---|---|
| Product: | Mesa | Reporter: | Ding Heng <hengx.ding> |
| Component: | Drivers/DRI/i965 | Assignee: | Ian Romanick <idr> |
| Status: | VERIFIED WONTFIX | QA Contact: | Intel 3D Bugs Mailing List <intel-3d-bugs> |
| Severity: | normal | ||
| Priority: | high | CC: | eero.t.tamminen |
| Version: | unspecified | ||
| Hardware: | Other | ||
| OS: | All | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
| Attachments: |
dmesg
xorg log |
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Description
Ding Heng
2015-04-20 07:40:29 UTC
Created attachment 115210 [details]
xorg log
Heng, is the given 10-20% shader compiler slowdown only from "i965: Don't set NirOptions for stages that will use the vec4 backend" commit, or total speed difference for larger set of changes? (In reply to Eero Tamminen from comment #2) > Heng, is the given 10-20% shader compiler slowdown only from "i965: Don't > set NirOptions for stages that will use the vec4 backend" commit, or total > speed difference for larger set of changes? Sorry for incorrect bisect result: d47405eb707b9921f70454049677a9d504ee3fa6 is the first bad commit commit d47405eb707b9921f70454049677a9d504ee3fa6 Author: Jason Ekstrand <jason.ekstrand@intel.com> Date: Fri Apr 10 16:24:11 2015 -0700 i965: Use NIR by default for fragment shaders GLSL IR vs. NIR shader-db results on i965: total instructions in shared programs: 2889747 -> 2890782 (0.04%) instructions in affected programs: 2425446 -> 2426481 (0.04%) helped: 3698 HURT: 5341 GLSL IR vs. NIR shader-db results on g4x: total instructions in shared programs: 2547252 -> 2550440 (0.13%) instructions in affected programs: 1984482 -> 1987670 (0.16%) helped: 2844 HURT: 4776 GLSL IR vs. NIR shader-db results on Iron Lake: total instructions in shared programs: 4053381 -> 4063828 (0.26%) instructions in affected programs: 3026601 -> 3037048 (0.35%) helped: 4110 HURT: 8331 GAINED: 1287 LOST: 9 GLSL IR vs. NIR shader-db results on Sandy Bridge: total instructions in shared programs: 5307041 -> 5236666 (-1.33%) instructions in affected programs: 3442908 -> 3372533 (-2.04%) helped: 11829 HURT: 5604 GAINED: 33 LOST: 18 GLSL IR vs. NIR shader-db results on Ivy Bridge: total instructions in shared programs: 4926333 -> 4857017 (-1.41%) instructions in affected programs: 3144042 -> 3074726 (-2.20%) helped: 11559 HURT: 4774 GAINED: 46 LOST: 25 GLSL IR vs. NIR shader-db results on Bay Trail: total instructions in shared programs: 4926333 -> 4857017 (-1.41%) instructions in affected programs: 3144042 -> 3074726 (-2.20%) helped: 11559 HURT: 4774 GAINED: 46 LOST: 25 GLSL IR vs. NIR shader-db results on Haswell: total instructions in shared programs: 4392487 -> 4293476 (-2.25%) instructions in affected programs: 2800180 -> 2701169 (-3.54%) helped: 13073 HURT: 3383 GAINED: 46 LOST: 23 GLSL IR vs. NIR shader-db results on Broadwell (FS only): total instructions in shared programs: 4378113 -> 4283025 (-2.17%) instructions in affected programs: 2743209 -> 2648121 (-3.47%) helped: 12470 HURT: 3609 GAINED: 64 LOST: 27 Signed-off-by: Jason Ekstrand <jason.ekstrand@intel.com> Acked-by: Matt Turner <mattst88@gmail.com> Acked-by: Kenneth Graunke <kenneth@whitecape.org> :040000 040000 056467d1b76d9b6d84041be3994abf5acc976caf 450c58fbecf671fef84ed91ca5999432e024a19d M src NIR was known to slow down Mesa shader compilation (further, from drop documented in bug 86140) and this slowdown was already accepted as NIR is pre-condition for further compiler optimizations. NIR compilation speed was optimized a bit in early May, but it is still slower than before NIR. Such is the nature of doing additional work. |
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