[Bug 80079] [IGT][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 #85 from Hector Velazquez <hector.franciscox.velazquez.suriano at intel.com> ---
This test was failing on GLK QA 

Tests List:

igt at gem_fence_upload@wc-contention

IGT-Version: 1.21-g94bd67c (x86_64) (Linux: 4.15.0-drm-tip-ww6-commit-078873d+
x86_64)

======================================
        output sample
======================================
. . .
**** DEBUG ****
(gem_fence_upload:1334) drmtest-DEBUG: Test requirement passed: !(fd<0)
(gem_fence_upload:1334) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(gem_fence_upload:1334) DEBUG: Test requirement passed: gem_mmap__has_wc(fd)
(gem_fence_upload:1334) DEBUG: Test requirement passed: num_fences > 0
(gem_fence_upload:1334) INFO: Contended upload rate for 1 linear threads/wc:   
380.147MiB/s
(gem_fence_upload:1334) INFO: Contended upload rate for 1 tiled threads/wc:    
388.642MiB/s
(gem_fence_upload:1334) INFO: Contended upload rate for 2 linear threads/wc:   
221.789MiB/s
(gem_fence_upload:1334) INFO: Contended upload rate for 2 tiled threads/wc:    
227.964MiB/s
(gem_fence_upload:1334) INFO: Contended upload rate for 4 linear threads/wc:   
183.065MiB/s
(gem_fence_upload:1334) INFO: Contended upload rate for 4 tiled threads/wc:    
182.446MiB/s
(gem_fence_upload:1334) INFO: Contended upload rate for 8 linear threads/wc:   
195.390MiB/s
(gem_fence_upload:1334) INFO: Contended upload rate for 8 tiled threads/wc:    
199.223MiB/s
(gem_fence_upload:1334) INFO: Contended upload rate for 16 linear threads/wc:  
181.304MiB/s
(gem_fence_upload:1334) INFO: Contended upload rate for 16 tiled threads/wc:   
187.220MiB/s
(gem_fence_upload:1334) INFO: Contended upload rate for 32 linear threads/wc:  
166.318MiB/s
(gem_fence_upload:1334) INFO: Contended upload rate for 32 tiled threads/wc:   
141.349MiB/s
(gem_fence_upload:1334) INFO: Contended upload rate for 64 linear threads/wc:  
108.291MiB/s
(gem_fence_upload:1334) INFO: Contended upload rate for 64 tiled threads/wc:   
109.369MiB/s
(gem_fence_upload:1334) CRITICAL: Test assertion failure function
wc_contention, file gem_fence_upload.c:385:
(gem_fence_upload:1334) CRITICAL: Failed assertion: linear[1] > 0.75 *
linear[0]
(gem_fence_upload:1334) igt-core-INFO: Stack trace:
(gem_fence_upload:1334) igt-core-INFO:   #0 [__igt_fail_assert+0x101]
(gem_fence_upload:1334) igt-core-INFO:   #1 [__real_main389+0xca7]
(gem_fence_upload:1334) igt-core-INFO:   #2 [main+0x23]
(gem_fence_upload:1334) igt-core-INFO:   #3 [__libc_start_main+0xf0]
(gem_fence_upload:1334) igt-core-INFO:   #4 [_start+0x29]
(gem_fence_upload:1334) igt-core-INFO:   #5 [<unknown>+0x29]
****  END  ****
. . .

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