[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 #83 from Hector Velazquez <hector.franciscox.velazquez.suriano at intel.com> ---
This test has failed on CFL QA 

Tests List:

igt at gem_fence_upload@wc-contention

using IGT-Version: 1.20-g84a3080 (x86_64) (Linux:
4.15.0-rc8-drm-tip-ww3-commit-37eb04c+ x86_64)

some tests has this output...
======================================
        output sample
======================================
. . .
**** DEBUG ****
(gem_fence_upload:2420) drmtest-DEBUG: Test requirement passed: !(fd<0)
(gem_fence_upload:2420) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(gem_fence_upload:2420) DEBUG: Test requirement passed: gem_mmap__has_wc(fd)
(gem_fence_upload:2420) DEBUG: Test requirement passed: num_fences > 0
(gem_fence_upload:2420) INFO: Contended upload rate for 1 linear threads/wc:   
373.247MiB/s
(gem_fence_upload:2420) INFO: Contended upload rate for 1 tiled threads/wc:    
891.663MiB/s
(gem_fence_upload:2420) INFO: Contended upload rate for 2 linear threads/wc:   
669.442MiB/s
(gem_fence_upload:2420) INFO: Contended upload rate for 2 tiled threads/wc:    
705.498MiB/s
(gem_fence_upload:2420) INFO: Contended upload rate for 4 linear threads/wc:   
542.502MiB/s
(gem_fence_upload:2420) INFO: Contended upload rate for 4 tiled threads/wc:    
540.541MiB/s
(gem_fence_upload:2420) INFO: Contended upload rate for 8 linear threads/wc:   
532.048MiB/s
(gem_fence_upload:2420) INFO: Contended upload rate for 8 tiled threads/wc:    
521.287MiB/s
(gem_fence_upload:2420) INFO: Contended upload rate for 16 linear threads/wc:  
491.285MiB/s
(gem_fence_upload:2420) INFO: Contended upload rate for 16 tiled threads/wc:   
500.045MiB/s
(gem_fence_upload:2420) INFO: Contended upload rate for 32 linear threads/wc:  
491.391MiB/s
(gem_fence_upload:2420) INFO: Contended upload rate for 32 tiled threads/wc:   
498.764MiB/s
(gem_fence_upload:2420) INFO: Contended upload rate for 64 linear threads/wc:  
476.714MiB/s
(gem_fence_upload:2420) INFO: Contended upload rate for 64 tiled threads/wc:   
490.182MiB/s
(gem_fence_upload:2420) CRITICAL: Test assertion failure function
wc_contention, file gem_fence_upload.c:385:
(gem_fence_upload:2420) CRITICAL: Failed assertion: linear[1] > 0.75 *
linear[0]
(gem_fence_upload:2420) igt-core-INFO: Stack trace:
(gem_fence_upload:2420) igt-core-INFO:   #0 [__igt_fail_assert+0x101]
(gem_fence_upload:2420) igt-core-INFO:   #1 [__real_main389+0xd70]
(gem_fence_upload:2420) igt-core-INFO:   #2 [main+0x27]
(gem_fence_upload:2420) igt-core-INFO:   #3 [__libc_start_main+0xf1]
(gem_fence_upload:2420) igt-core-INFO:   #4 [_start+0x2a]
(gem_fence_upload:2420) igt-core-INFO:   #5 [<unknown>+0x2a]
****  END  ****
. . .

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