Bug 57830 - [IVB bisected]Lightsmark performance reduced by 9%
Summary: [IVB bisected]Lightsmark performance reduced by 9%
Status: CLOSED DUPLICATE of bug 55905
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: unspecified
Hardware: All Linux (All)
: high major
Assignee: Intel GFX Bugs mailing list
QA Contact: Intel GFX Bugs mailing list
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2012-12-03 08:17 UTC by ye.tian
Modified: 2015-05-20 01:19 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:

Attachments

Description ye.tian 2012-12-03 08:17:21 UTC 
System Environment:       
----------------------------------------------
Platform:IVB
Libdrm:	(master)libdrm-2.4.40-3-g0980633afd9c7eecc0c75ef3bea4d3c6b7aa1898
Mesa:	(9.0)d0a9ab29b2c8abf2900b1095883cba71b05b5cd9
Xserver:(server-1.13-branch)xorg-server-1.13.0.901
Kernel: (drm-intel-fixes)7b01e260a6cad9152eefb44ce64f3a2073af1e6b

Bug detailed description:
----------------------------------------------
Lightsmark performance reduced by ~9% only on IVB. 
It's Kernel regression. By bisected, show that 61939d9 is the first bad commit.

commit 61939d977d66951b04cfd4fbe75705614b98ecad
Author: Jesse Barnes <jbarnes@virtuousgeek.org>
Date: Tue Oct 2 17:43:38 2012 -0500

drm/i915: implement WaForceL3Serialization on VLV and IVB

Performance:
-----------------------------------------------
ff1f525 is 61939d9 parents commit.
             61939d9  ff1f525      61939d9 vs. ff1f525
xinit           77      71               9%
gnome-session   83      77               9%

Reproduce steps:
---------------------------------------------
1, xinit&
2, vblank_mode=0  ./backend silent 1920x1080
Comment 1 Chris Wilson 2012-12-03 08:30:29 UTC 

*** This bug has been marked as a duplicate of bug 55905 ***

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