[Bug 97942] New: [IGT] [BYT] /gem_mmap_gtt subtest basic-wc fails due to Test assertion failure

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97942

            Bug ID: 97942
           Summary: [IGT] [BYT] /gem_mmap_gtt subtest basic-wc fails due
                    to Test assertion failure
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: luis.botello.ortega at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 126799
  --> https://bugs.freedesktop.org/attachment.cgi?id=126799&action=edit
dmesg

Description
==========================================
gem_mmap_gtt subtest basic-wc fails due to Test assertion failure

Software Configuration
===========================================
drm:  commit: 0659558f6418693ad203b5de2f1bc4fa9f28708e
mesa:  commit: 8b06176f310f65628ce136b90a99005278ba5e0d
cairo:  commit: db8a7f1697c49ae4942d2aa49eed52dd73dd9c7a
xorg-server-macros:  commit: d7acec2d3a3abe79814ceb72e2c0d4d95ed31d37
xserver:  commit: 3ef51c5c74297937002668b0c507fa88550db67e
xf86-video-intel:  commit: 15c5ff12459a034b552c787047d1af6d61047cd6
libva: commit: 7aa2dd979a3758e1f6378344b235595c5028a9e7
vaapi-intel-driver:  commit: 36fbd817428d3a257f59bb1ca28ed491c3981616
piglit:  commit: 1b071c6304dc69a3f754fd1196afde8f9688bb8e
intel-gpu-tool:  commit: 200237acac00f24730b0c5b4362936b6c510b0ed

kernel 
commit aab15c274da587bcab19376d2caa9d6626440335
Author: Jani Nikula <jani.nikula at intel.com>
Date:   Mon Sep 26 15:11:53 2016 +0300

    drm-intel-nightly: 2016y-09m-26d-12h-11m-33s UTC integration manifest


Hardware Configuration
=============================================
Platform: Acer Aspire XC-603
CPU: Intel(R) Pentium(R) CPU  J2900  @ 2.41GHz (family 6, model 55, stepping 8)
Motherboard: Aspire XC-603
GPU: Intel® HD Graphics - Intel Corporation Atom Processor Z36xxx/Z37xxx Series
Graphics & Display (rev 0e)

Steps to reproduce
=========================================
./gem_mmap_gtt --run-subtest basic-wc

IGT output
==========================================
IGT-Version: 1.16-g32b2021 (x86_64) (Linux: 4.8.0-rc8-nightly+ x86_64)
(gem_mmap_gtt:14618) CRITICAL: Test assertion failure function test_wc, file
gem_mmap_gtt.c:283:
(gem_mmap_gtt:14618) CRITICAL: Failed assertion: gtt_writes > cpu_writes/2
(gem_mmap_gtt:14618) CRITICAL: Write-Combined writes are expected to be roughly
equivalent to WB writes: WC (gtt)=2441.84MiB/s, WB (cpu)=5304.02MiB/s
Stack trace:
  #0 [__igt_fail_assert+0xf1]
  #1 [__real_main626+0x10ce]
  #2 [main+0x29]
  #3 [__libc_start_main+0xf0]
  #4 [_start+0x29]
  #5 [<unknown>+0x29]
Subtest basic-wc failed.
**** DEBUG ****
(gem_mmap_gtt:14618) DEBUG: 3398 GTT reads in 200us
(gem_mmap_gtt:14618) DEBUG: 125022 GTT writes in 200us
(gem_mmap_gtt:14618) DEBUG: 271566 CPU writes in 200us
(gem_mmap_gtt:14618) CRITICAL: Test assertion failure function test_wc, file
gem_mmap_gtt.c:283:
(gem_mmap_gtt:14618) CRITICAL: Failed assertion: gtt_writes > cpu_writes/2
(gem_mmap_gtt:14618) CRITICAL: Write-Combined writes are expected to be roughly
equivalent to WB writes: WC (gtt)=2441.84MiB/s, WB (cpu)=5304.02MiB/s
****  END  ****
Subtest basic-wc: FAIL (0.631s)


Attachments
==============================================
dmesg

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