[Bug 107307] New: [BAT] Memory performance issue

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107307

            Bug ID: 107307
           Summary: [BAT] Memory performance issue
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: martin.peres at free.fr
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

On two separate machines, we got a performance issue that we never caught
before. This is likely the result of some background activity while running the
tests.

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4409_1/fi-cfl-8109u/igt@gem_mmap_gtt@basic-wc.html

(gem_mmap_gtt:2981) CRITICAL: Test assertion failure function test_wc, file
../tests/gem_mmap_gtt.c:282:
(gem_mmap_gtt:2981) CRITICAL: Failed assertion: gtt_writes > 2*gtt_reads
(gem_mmap_gtt:2981) CRITICAL: Write-Combined writes are expected to be much
faster than reads: read=171.86MiB/s, write=337.03MiB/s
Subtest basic-wc failed.

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4370_120/fi-bsw-n3050/igt@gem_mmap_gtt@basic-wc.html

(gem_mmap_gtt:3044) CRITICAL: Test assertion failure function test_wc, file
../tests/gem_mmap_gtt.c:286:
(gem_mmap_gtt:3044) CRITICAL: Failed assertion: gtt_writes > cpu_writes/2
(gem_mmap_gtt:3044) CRITICAL: Write-Combined writes are expected to be roughly
equivalent to WB writes: WC (gtt)=665.21MiB/s, WB (cpu)=1352.17MiB/s
Subtest basic-wc failed.

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