[Bug 97017] New: [SKL GT3e] ~10% performance drop in most benchmarks

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97017

            Bug ID: 97017
           Summary: [SKL GT3e] ~10% performance drop in most benchmarks
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: eero.t.tamminen at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org
     i915 platform: SKL

A change in drm-intel-nightly causes ~10% performance drop in benchmarks:
- 10-12% in GpuTest v0.7 "pixmark" (piano, volplosion, Julia32) tests
- 9-11% in GfxBench 4.x ALU, ALU2 and tessellation tests, both onscreen &
offscreen
- 9-12% in SynMark batch, geometry, pixel, vertex and compute shader tests
- 11% in GLB 2.7 Fill tests, 8% in T-Rex & Egypt onscreen, 2% in Egypt & T-Rex
offscreen
- 5-6% in Unigine Heaven & Valley

GpuTest and GLB 2.7 tests are run as windowed, rest is run as fullscreen in
monitor native resolution.

Basically everything except CPU bound 3D tests dropped, regardless of whether
it's:
- mostly GPU ALU or memory bandwidth limited
- fullscreened or windowed
- onscreen or offscreen

Drop happens only on SKL GT3e, there's no drop e.g. on SKL GT2 or HSW GT3e.

Drop happened between following 13th and 15th of July drm-intel-nightly
commits:
- Good: 5cd2699dfcf12a399553c3186b718667523a19fc
- Bad:  5cd2699dfcf12a399553c3186b718667523a19fc

It's fully reproducible just by changing kernel, but it cannot be automatically
bisected by Jenkins because large number of commits in-between are in
non-buildable state.

-- 
You are receiving this mail because:
You are the assignee for the bug.
You are on the CC list for the bug.
You are the QA Contact for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20160721/77871744/attachment-0001.html>