[Bug 80079] [All] Performance degradation due to fence contention with igt/gem_fence_upload

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80079

--- Comment #71 from Hector Velazquez <hector.franciscox.velazquez.suriano at intel.com> ---
The following tests FAIL on SKL 

Tests List:

igt at gem_fence_upload@performance
igt at gem_fence_upload@thread-performance-write
igt at gem_fence_upload@wc-contention


======================================
        Output Sample
======================================
...
(gem_fence_upload:1780) INFO: Contended upload rate for 16 linear threads/wc:  
164.418MiB/s
(gem_fence_upload:1780) INFO: Contended upload rate for 16 tiled threads/wc:   
161.001MiB/s
(gem_fence_upload:1780) INFO: Contended upload rate for 32 linear threads/wc:  
155.982MiB/s
(gem_fence_upload:1780) INFO: Contended upload rate for 32 tiled threads/wc:   
157.918MiB/s
(gem_fence_upload:1780) INFO: Contended upload rate for 64 linear threads/wc:  
153.314MiB/s
(gem_fence_upload:1780) INFO: Contended upload rate for 64 tiled threads/wc:   
155.209MiB/s
(gem_fence_upload:1780) CRITICAL: Test assertion failure function
wc_contention, file gem_fence_upload.c:387:
(gem_fence_upload:1780) CRITICAL: Failed assertion: linear[1] > 0.75 *
linear[0]
(gem_fence_upload:1780) igt-core-INFO: Stack trace:
(gem_fence_upload:1780) igt-core-INFO:   #0 [__igt_fail_assert+0x101]
(gem_fence_upload:1780) igt-core-INFO:   #1 [__real_main391+0xca7]
(gem_fence_upload:1780) igt-core-INFO:   #2 [main+0x33]
(gem_fence_upload:1780) igt-core-INFO:   #3 [__libc_start_main+0xf1]
(gem_fence_upload:1780) igt-core-INFO:   #4 [_start+0x29]
(gem_fence_upload:1780) igt-core-INFO:   #5 [<unknown>+0x29]
****  END  ****
Stack trace:
  #0 [__igt_fail_assert+0x101]
  #1 [__real_main391+0xca7]
  #2 [main+0x33]
  #3 [__libc_start_main+0xf1]
  #4 [_start+0x29]
  #5 [<unknown>+0x29]
Subtest wc-contention: FAIL (25.698s)
(gem_fence_upload:1780) igt-core-DEBUG: Exiting with status code 99
...

This is my configuration:

======================================
        Graphic stack
======================================

Component: drm
    tag: libdrm-2.4.81-53-gd55d080
    commit: d55d0804f9e37637d7510f38f97e07a50c6b7baa

Component: cairo
    tag: 1.15.6-30-gc29db4f
    commit: c29db4f0de52727406a8b62f4da9a382084b5a79

Component: intel-gpu-tools
    tag: intel-gpu-tools-1.19-239-g918863f
    commit: 918863f8e3e8f49235fd2e4a36e11f386c06c11c

Component: piglit
    tag: piglit-v1
    commit: dab15137044c34023b1a843e72e781b03b17548b



======================================
             Software
======================================
kernel version              : 4.13.0-drm-tip-ww36-commit-7a827ab+
hostname                    : gfx-desktop
architecture                : x86_64
os version                  : Ubuntu 16.10
os codename                 : yakkety
kernel driver               : i915
bios revision               : 5.6
bios release date           : 09/29/2016
hardware acceleration       : disabled
swap partition              : enabled on (/dev/sda3)

======================================
        Graphic drivers
======================================
libdrm                      : 2.4.83
cairo                       : 1.15.9
intel-gpu-tools (tag)       : intel-gpu-tools-1.19-234-g490b386
intel-gpu-tools (commit)    : 490b386

======================================
             Hardware
======================================
platform                   : Skylake Canyon
motherboard id             : NUC6i7KYB
form factor                : Desktop
cpu family                 : Core i7
cpu family id              : 6
cpu information            : Intel(R) Core(TM) i7-6770HQ CPU @ 2.60GHz
gpu card                   : Intel Corporation Iris Pro Graphics 580 (rev 09)
(prog-if 00 [VGA controller])
memory ram                 : 31.31 GB
max memory ram             : 32 GB
cpu thread                 : 8
cpu core                   : 4
cpu model                  : 94
cpu stepping               : 3
socket                     : Other
signature                  : Type 0, Family 6, Model 94, Stepping 3
hard drive                 : 223GiB (240GB)
current cd clock frequency : 337500 kHz
maximum cd clock frequency : 675000 kHz
displays connected         : DP-1 DP-3

======================================
             Firmware
======================================
dmc fw loaded             : yes
dmc version               : 1.26
guc fw loaded             : SUCCESS
guc version wanted        : 6.1
guc version found         : 6.1
huc fw loaded             : yes

======================================
             kernel parameters
======================================
quiet splash drm.debug=0x1e i915.enable_guc_submission=2
i915.enable_guc_loading=2 i915.alpha_support=1

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