[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 #89 from Hector Velazquez <hector.franciscox.velazquez.suriano at intel.com> ---
This tests was failing on CNL QA

Test list:
igt at gem_fence_upload@thread-contention

output sample:
. . .
**** DEBUG ****
(gem_fence_upload:741) drmtest-DEBUG: Test requirement passed: !(fd<0)
(gem_fence_upload:741) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(gem_fence_upload:741) DEBUG: Test requirement passed: num_fences > 0
(gem_fence_upload:741) INFO: Contended upload rate for 1 linear threads:       
167.357MiB/s
(gem_fence_upload:741) INFO: Contended upload rate for 1 tiled threads:
303.577MiB/s
(gem_fence_upload:741) INFO: Contended upload rate for 2 linear threads:       
226.462MiB/s
(gem_fence_upload:741) INFO: Contended upload rate for 2 tiled threads:
275.454MiB/s
(gem_fence_upload:741) INFO: Contended upload rate for 4 linear threads:       
193.417MiB/s
(gem_fence_upload:741) INFO: Contended upload rate for 4 tiled threads:
244.463MiB/s
(gem_fence_upload:741) INFO: Contended upload rate for 8 linear threads:       
243.753MiB/s
(gem_fence_upload:741) INFO: Contended upload rate for 8 tiled threads:
254.078MiB/s
(gem_fence_upload:741) INFO: Contended upload rate for 16 linear threads:      
260.476MiB/s
(gem_fence_upload:741) INFO: Contended upload rate for 16 tiled threads:       
246.775MiB/s
(gem_fence_upload:741) INFO: Contended upload rate for 32 linear threads:      
232.786MiB/s
(gem_fence_upload:741) INFO: Contended upload rate for 32 tiled threads:       
217.966MiB/s
(gem_fence_upload:741) INFO: Contended upload rate for 64 linear threads:      
207.894MiB/s
(gem_fence_upload:741) INFO: Contended upload rate for 64 tiled threads:       
183.230MiB/s
(gem_fence_upload:741) CRITICAL: Test assertion failure function
thread_contention, file gem_fence_upload.c:330:
(gem_fence_upload:741) CRITICAL: Failed assertion: tiled[1] > 0.75 * tiled[0]
(gem_fence_upload:741) igt-core-INFO: Stack trace:
(gem_fence_upload:741) igt-core-INFO:   #0 [__igt_fail_assert+0x101]
(gem_fence_upload:741) igt-core-INFO:   #1 [__real_main389+0xce9]
(gem_fence_upload:741) igt-core-INFO:   #2 [main+0x23]
(gem_fence_upload:741) igt-core-INFO:   #3 [__libc_start_main+0xf1]
(gem_fence_upload:741) igt-core-INFO:   #4 [_start+0x29]
(gem_fence_upload:741) igt-core-INFO:   #5 [<unknown>+0x29]
****  END  ****
. . .

software:
IGT-Version: 1.22-g2ef96ec (x86_64) (Linux:
4.16.0-rc7-drm-tip-ww15-commit-d123888+ x86_64)

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