[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 #84 from Ricardo Perez <ricardo.o.perez at intel.com> ---
Using CoffeeLake S UDIMM RVP QA system, the following tests are failing:

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

Running: 
IGT-Version: 1.21-g37bd27f (x86_64) (Linux:
4.15.0-rc9-drm-intel-qa-ww4-commit-59275f1+ x86_64)
------------------------------------------------------------------------------
For igt at gem_fence_upload@performance:

**** DEBUG ****
(gem_fence_upload:6587) drmtest-DEBUG: Test requirement passed: !(fd<0)
(gem_fence_upload:6587) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(gem_fence_upload:6587) DEBUG: Test requirement passed: num_fences > 0
(gem_fence_upload:6587) INFO: Upload rate for 2 linear surfaces:       
19878.284MiB/s
(gem_fence_upload:6587) INFO: Upload rate for 2 tiled surfaces: 25006.410MiB/s
(gem_fence_upload:6587) INFO: Upload rate for 4 linear surfaces:       
25009.159MiB/s
(gem_fence_upload:6587) INFO: Upload rate for 4 tiled surfaces: 24897.426MiB/s
(gem_fence_upload:6587) INFO: Upload rate for 8 linear surfaces:       
24973.859MiB/s
(gem_fence_upload:6587) INFO: Upload rate for 8 tiled surfaces: 23901.221MiB/s
(gem_fence_upload:6587) INFO: Upload rate for 16 linear surfaces:      
21002.220MiB/s
(gem_fence_upload:6587) INFO: Upload rate for 16 tiled surfaces:       
21176.522MiB/s
(gem_fence_upload:6587) INFO: Upload rate for 32 linear surfaces:      
21241.701MiB/s
(gem_fence_upload:6587) INFO: Upload rate for 32 tiled surfaces:       
24521.697MiB/s
(gem_fence_upload:6587) INFO: Upload rate for 64 linear surfaces:      
21442.437MiB/s
(gem_fence_upload:6587) INFO: Upload rate for 64 tiled surfaces:       
9607.570MiB/s
(gem_fence_upload:6587) CRITICAL: Test assertion failure function performance,
file gem_fence_upload.c:104:
(gem_fence_upload:6587) CRITICAL: Failed assertion: tiled[1] > 0.75 * tiled[0]
(gem_fence_upload:6587) igt-core-INFO: Stack trace:
(gem_fence_upload:6587) igt-core-INFO:   #0 [__igt_fail_assert+0x101]
(gem_fence_upload:6587) igt-core-INFO:   #1 [__real_main389+0xc43]
(gem_fence_upload:6587) igt-core-INFO:   #2 [main+0x27]
(gem_fence_upload:6587) igt-core-INFO:   #3 [__libc_start_main+0xf1]
(gem_fence_upload:6587) igt-core-INFO:   #4 [_start+0x2a]
(gem_fence_upload:6587) igt-core-INFO:   #5 [<unknown>+0x2a]
****  END  ****
------------------------------------------------------------------------------

For igt at gem_fence_upload@thread-performance-write:

**** DEBUG ****
(gem_fence_upload:7801) drmtest-DEBUG: Test requirement passed: !(fd<0)
(gem_fence_upload:7801) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(gem_fence_upload:7801) DEBUG: Test requirement passed: num_fences > 0
(gem_fence_upload:7801) INFO: Upload rate for 2 linear surfaces, 2 threads:    
6316.621MiB/s
(gem_fence_upload:7801) INFO: Upload rate for 2 tiled surfaces, 2 threads:     
6156.214MiB/s
(gem_fence_upload:7801) INFO: Upload rate for 4 linear surfaces, 4 threads:    
7206.396MiB/s
(gem_fence_upload:7801) INFO: Upload rate for 4 tiled surfaces, 4 threads:     
7037.607MiB/s
(gem_fence_upload:7801) INFO: Upload rate for 8 linear surfaces, 8 threads:    
7581.142MiB/s
(gem_fence_upload:7801) INFO: Upload rate for 8 tiled surfaces, 8 threads:     
7817.271MiB/s
(gem_fence_upload:7801) INFO: Upload rate for 16 linear surfaces, 16 threads:  
7761.104MiB/s
(gem_fence_upload:7801) INFO: Upload rate for 16 tiled surfaces, 16 threads:   
7697.165MiB/s
(gem_fence_upload:7801) INFO: Upload rate for 32 linear surfaces, 32 threads:  
7900.625MiB/s
(gem_fence_upload:7801) INFO: Upload rate for 32 tiled surfaces, 32 threads:   
7796.084MiB/s
(gem_fence_upload:7801) INFO: Upload rate for 64 linear surfaces, 64 threads:  
7941.309MiB/s
(gem_fence_upload:7801) INFO: Upload rate for 64 tiled surfaces, 64 threads:   
1486.072MiB/s
(gem_fence_upload:7801) CRITICAL: Test assertion failure function
thread_performance, file gem_fence_upload.c:242:
(gem_fence_upload:7801) CRITICAL: Failed assertion: tiled[1] > 0.75 * tiled[0]
(gem_fence_upload:7801) igt-core-INFO: Stack trace:
(gem_fence_upload:7801) igt-core-INFO:   #0 [__igt_fail_assert+0x101]
(gem_fence_upload:7801) igt-core-INFO:   #1 [thread_performance+0x714]
(gem_fence_upload:7801) igt-core-INFO:   #2 [__real_main389+0xd15]
(gem_fence_upload:7801) igt-core-INFO:   #3 [main+0x27]
(gem_fence_upload:7801) igt-core-INFO:   #4 [__libc_start_main+0xf1]
(gem_fence_upload:7801) igt-core-INFO:   #5 [_start+0x2a]
(gem_fence_upload:7801) igt-core-INFO:   #6 [<unknown>+0x2a]
****  END  ****

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