Bug 90134

Summary: [BSW Bisected]GFXBench3_gl_driver/GFXBench3_gl_driver_offscreen performance reduced by 11%
Product: DRI Reporter: wendy.wang
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED WORKSFORME QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium CC: christophe.prigent, eero.t.tamminen, intel-gfx-bugs
Version: unspecifiedKeywords: bisected, regression
Hardware: Other   
OS: All   
See Also: https://bugs.freedesktop.org/show_bug.cgi?id=90112
Whiteboard:
i915 platform: BSW/CHT i915 features: power/GT
Attachments:
Description Flags
dmesg file none

Description wendy.wang 2015-04-22 05:07:28 UTC 
Created attachment 115257 [details]
dmesg file

System Environment: 
Failed platform: BSW

GFX SW stack:
 Libdrm:		(master)libdrm-2.4.60-34-g0d78b37b1cac304ce5e84d1207f0a43abd29c000
 Mesa:		(master)1eac3ae1a6ebecf353054d937dd603a11ea33fb3
 Xserver:		(master)xorg-server-1.17.0-76-gb1029716e41e252f149b82124a149da180607c96
 Xf86_video_intel:		(master)2.99.917-274-g75d87762471e195dddd73056fc6a06e17db1c8b0
 Cairo:		(master)2cf2d8e340a325adb205baf8e4bd64e1d1858008
 Libva:		(master)062a63932c0f1439aa587aa986bbcfb758ff38f2
 Libva_intel_driver:		(master)890f538f62707ec07a6accdb65bafcaffc941bb1
 Kernel:   (drm-intel-nightly)d600654ab94b325f253e267422dcf60302120ea0


Regression: Yes, it's kernel regression
Bisect from drm-intel-next-queued branch, the first bad commit shows as below:

commit f4f71c7dfc5c989f53a1861f3ac42e24018fad4c
Author: Deepak S <deepak.s@linux.intel.com>
AuthorDate: Sat Mar 28 15:23:35 2015 +0530
Commit: Daniel Vetter <daniel.vetter@ffwll.ch>
CommitDate: Thu Apr 16 16:05:24 2015 +0200

    drm/i915: Re-adjusting rc6 promotional timer for chv


Bug description:
GFXBench3_gl_driver/GFXBench3_gl_driver_offscreen performance reduced by 11% 

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

Dmesg file has been attached.
Comment 1 Chris Wilson 2015-04-22 07:53:37 UTC 
However since RPS is suboptimal for BSW, see bug 90112, we should probably wait until we have that resolved before making perf judgements.
Comment 2 Chris Wilson 2017-03-02 11:28:32 UTC 
Braswell RPS has been tweaked. Let's hope for the best...

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