[Bug 101677] [GEN7/8] 1-10% perf drop on in offscreen benchmarks with "intel/isl: Only create a CCS buffer if the image supports rendering"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101677

            Bug ID: 101677
           Summary: [GEN7/8] 1-10% perf drop on in offscreen benchmarks
                    with "intel/isl: Only create a CCS buffer if the image
                    supports rendering"
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: nanleychery at gmail.com
          Reporter: eero.t.tamminen at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Performance in all (GPU bound) GLB 2.7 & GfxBench v4.0 offscreen benchmarks
dropped on 26th June, with a commit that ezbench bisected to:
-------------------------------------------------------
commit 8aaa13467dc289d35dc7900ab9fab9a7689c4178
Author:     Nanley Chery <nanley.g.chery at intel.com>
AuthorDate: Mon Mar 6 14:27:44 2017 -0800
Commit:     Nanley Chery <nanley.g.chery at intel.com>
CommitDate: Mon Jun 26 11:09:12 2017 -0700

    intel/isl: Only create a CCS buffer if the image supports rendering

    v2: Omit the commit message.

    Signed-off-by: Nanley Chery <nanley.g.chery at intel.com>
    Reviewed-by: Iago Toral Quiroga <itoral at igalia.com>
    Reviewed-by: Jason Ekstrand <jason at jlekstrand.net>
-------------------------------------------------------

On BDW GT3, GLB 2.7 Egypt offscreen test drops by ~10% and GLB 2.7 Fill
offscreen & GfxBench v4.0 Tessellation offscreen drop by ~7%.

Fairly similar drops are visible on BDW GT2 and somewhat smaller drops on BSW,
HSW GT2 and BYT.

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