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igt@gem_mmap_gtt@basic-wc - fail - Failed assertion: gtt_writes > 2*gtt_reads, Write-Combined writes are expected to be much faster than reads

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_10337/shard-rkl-5/igt@gem_mmap_gtt@basic-wc.html

Err	
Starting subtest: basic-wc
(gem_mmap_gtt:1291) CRITICAL: Test assertion failure function test_wc, file ../tests/i915/gem_mmap_gtt.c:314:
(gem_mmap_gtt:1291) CRITICAL: Failed assertion: gtt_writes > 2*gtt_reads
(gem_mmap_gtt:1291) CRITICAL: Write-Combined writes are expected to be much faster than reads: read=56.11MiB/s, write=102.54MiB/s
Subtest basic-wc failed.
**** DEBUG ****
(gem_mmap_gtt:1291) DEBUG: 2873 GTT reads in 200us
(gem_mmap_gtt:1291) DEBUG: 5250 GTT writes in 200us
(gem_mmap_gtt:1291) DEBUG: 5120 CPU writes in 200us
(gem_mmap_gtt:1291) CRITICAL: Test assertion failure function test_wc, file ../tests/i915/gem_mmap_gtt.c:314:
(gem_mmap_gtt:1291) CRITICAL: Failed assertion: gtt_writes > 2*gtt_reads
(gem_mmap_gtt:1291) CRITICAL: Write-Combined writes are expected to be much faster than reads: read=56.11MiB/s, write=102.54MiB/s
(gem_mmap_gtt:1291) igt_core-INFO: Stack trace:
(gem_mmap_gtt:1291) igt_core-INFO:   #0 ../lib/igt_core.c:1745 __igt_fail_assert()
(gem_mmap_gtt:1291) igt_core-INFO:   #1 ../tests/i915/gem_mmap_gtt.c:316 __real_main1250()
(gem_mmap_gtt:1291) igt_core-INFO:   #2 ../tests/i915/gem_mmap_gtt.c:1250 main()
(gem_mmap_gtt:1291) igt_core-INFO:   #3 ../csu/libc-start.c:344 __libc_start_main()
(gem_mmap_gtt:1291) igt_core-INFO:   #4 [_start+0x2a]
****  END  ****
Subtest basic-wc: FAIL (0.684s)
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