[Bug 80784] New: [BDW]90% CPU usage at on one of the CPU cores when run Synmark2_v5_3_0_OglDrvCtx

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80784

          Priority: medium
            Bug ID: 80784
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW]90% CPU usage at on one of the CPU cores when run
                    Synmark2_v5_3_0_OglDrvCtx
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: mengmeng.meng at intel.com
          Hardware: All
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

System Environment:       
----------------------------------------------------------------------
Platform: BDW
Libdrm:(master)libdrm-2.4.54-17-ge8c3c1358ecaf4e90f7d43762357ae6f8e2022b6
Mesa:(master)1bfc0a11027449ae7ab7c28eb695f26de530eccf
Xf86_video_intel:(master)2.99.912-200-ge6e5330857097eb2caafa89d571d12e4bb15f539
Cairo:(master)550385fb004e6064305518cf265adc03bd2d0c0b
Libva:(master)c61d8c6ce9ffc27320e9e177c1e1123d5f1b5014
Libva_intel_driver:(master)c5cb17ea86f0065a939d3636dd26651c93d497c8
Kernel:    (drm-intel-nightly)git-9bfcb9

Bug detailed description:
------------------------------------------------------------------------
Compared with HSW, BDW 90% CPU usage at on one of the CPU cores when run
Synmark2_v5_3_0_OglDrvCtx. And BDW OglDrvCtx performance is slower by 26% than
HSW.
The issue is not a regression and exists on all kernel branches:
-drm-intel-nightly bad
 commit a7665faa31dbbbae25e376508a9b3781e25d09e2
 Author: Jani Nikula <jani.nikula at intel.com>
 Date:   Mon Jun 30 13:50:19 2014 +0300
    drm-intel-nightly: 2014y-06m-30d-13h-49m-54s integration manifest

-drm-intel-fixes bad
 commit 84b4e042c4707bd1bf05094a51111403d680dc39
 Author: Jesse Barnes <jbarnes at virtuousgeek.org>
 Date:   Wed Jun 25 08:24:29 2014 -0700
    drm/i915: only apply crt_present check on VLV

-drm-intel-next-queued bad
 commit 91565c85b66db820f01894a971d39aaef60c4325
 Author: Matt Roper <matthew.d.roper at intel.com>
 Date:   Tue Jun 24 17:05:02 2014 -0700
    drm/i915: Don't try to look up object for non-existent fb


CPU and GPU on BDW
-------------
- ~90% CPU usage at least on one of the CPU cores,"according to "top" (press 1
to see all cores)
- clearly <100% "render" value in "intel_gpu_top"

Reproduce steps:
--------------------------------------------------------------------
1. xinit&
2../synmark2 OglDrvCtx
3. top(get "top" output from during that test run (not from first 5 secs of
calibration, but after that)

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