[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

Elizabeth <elizabethx.de.la.torre.mena at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      i915 platform|ALL                         |CNL, CFL, KBL, SKL, BDW,
                   |                            |HSW, IVB, SNB

--- Comment #88 from Elizabeth <elizabethx.de.la.torre.mena at intel.com> ---
This is still valid with the tests and in all the platforms:

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

Results for igt at gem_fence_upload@wc-contention
Result: fail
Out     
IGT-Version: 1.22-g2e92134 (x86_64) (Linux:
4.16.0-rc5-drm-intel-qa-ww11-commit-e867298+ x86_64)
Contended upload rate for 1 linear threads/wc:  698.934MiB/s
Contended upload rate for 1 tiled threads/wc:   723.066MiB/s
Contended upload rate for 2 linear threads/wc:  351.208MiB/s
Contended upload rate for 2 tiled threads/wc:   403.104MiB/s
Contended upload rate for 4 linear threads/wc:  217.407MiB/s
Contended upload rate for 4 tiled threads/wc:   217.127MiB/s
Contended upload rate for 8 linear threads/wc:  230.568MiB/s
Contended upload rate for 8 tiled threads/wc:   251.303MiB/s
Contended upload rate for 16 linear threads/wc: 353.497MiB/s
Contended upload rate for 16 tiled threads/wc:  263.751MiB/s
Contended upload rate for 32 linear threads/wc: 229.063MiB/s
Contended upload rate for 32 tiled threads/wc:  263.710MiB/s
Contended upload rate for 64 linear threads/wc: 230.086MiB/s
Contended upload rate for 64 tiled threads/wc:  240.488MiB/s
Stack trace:
  #0 [__igt_fail_assert+0x101]
  #1 [__real_main389+0xca7]
  #2 [main+0x23]
  #3 [__libc_start_main+0xf1]
  #4 [_start+0x29]
  #5 [<unknown>+0x29]
Subtest wc-contention: FAIL (16.453s)
Err     
(gem_fence_upload:8700) CRITICAL: Test assertion failure function
wc_contention, file gem_fence_upload.c:385:
(gem_fence_upload:8700) CRITICAL: Failed assertion: linear[1] > 0.75 *
linear[0]
Subtest wc-contention failed.
**** DEBUG ****
(gem_fence_upload:8700) drmtest-DEBUG: Test requirement passed: !(fd<0)
(gem_fence_upload:8700) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(gem_fence_upload:8700) DEBUG: Test requirement passed: gem_mmap__has_wc(fd)
(gem_fence_upload:8700) DEBUG: Test requirement passed: num_fences > 0
(gem_fence_upload:8700) INFO: Contended upload rate for 1 linear threads/wc:   
698.934MiB/s
(gem_fence_upload:8700) INFO: Contended upload rate for 1 tiled threads/wc:    
723.066MiB/s
(gem_fence_upload:8700) INFO: Contended upload rate for 2 linear threads/wc:   
351.208MiB/s
(gem_fence_upload:8700) INFO: Contended upload rate for 2 tiled threads/wc:    
403.104MiB/s
(gem_fence_upload:8700) INFO: Contended upload rate for 4 linear threads/wc:   
217.407MiB/s
(gem_fence_upload:8700) INFO: Contended upload rate for 4 tiled threads/wc:    
217.127MiB/s
(gem_fence_upload:8700) INFO: Contended upload rate for 8 linear threads/wc:   
230.568MiB/s
(gem_fence_upload:8700) INFO: Contended upload rate for 8 tiled threads/wc:    
251.303MiB/s
(gem_fence_upload:8700) INFO: Contended upload rate for 16 linear threads/wc:  
353.497MiB/s
(gem_fence_upload:8700) INFO: Contended upload rate for 16 tiled threads/wc:   
263.751MiB/s
(gem_fence_upload:8700) INFO: Contended upload rate for 32 linear threads/wc:  
229.063MiB/s
(gem_fence_upload:8700) INFO: Contended upload rate for 32 tiled threads/wc:   
263.710MiB/s
(gem_fence_upload:8700) INFO: Contended upload rate for 64 linear threads/wc:  
230.086MiB/s
(gem_fence_upload:8700) INFO: Contended upload rate for 64 tiled threads/wc:   
240.488MiB/s
(gem_fence_upload:8700) CRITICAL: Test assertion failure function
wc_contention, file gem_fence_upload.c:385:
(gem_fence_upload:8700) CRITICAL: Failed assertion: linear[1] > 0.75 *
linear[0]
(gem_fence_upload:8700) igt-core-INFO: Stack trace:
(gem_fence_upload:8700) igt-core-INFO:   #0 [__igt_fail_assert+0x101]
(gem_fence_upload:8700) igt-core-INFO:   #1 [__real_main389+0xca7]
(gem_fence_upload:8700) igt-core-INFO:   #2 [main+0x23]
(gem_fence_upload:8700) igt-core-INFO:   #3 [__libc_start_main+0xf1]
(gem_fence_upload:8700) igt-core-INFO:   #4 [_start+0x29]
(gem_fence_upload:8700) igt-core-INFO:   #5 [<unknown>+0x29]
****  END  ****

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