CI_DRM_3133 fi-byt-n2820: (gem_mmap_gtt:3108) CRITICAL: Test assertion failure function test_wc, file gem_mmap_gtt.c:286: (gem_mmap_gtt:3108) CRITICAL: Failed assertion: gtt_writes > cpu_writes/2 (gem_mmap_gtt:3108) CRITICAL: Write-Combined writes are expected to be roughly equivalent to WB writes: WC (gtt)=1686.82MiB/s, WB (cpu)=3437.54MiB/s Subtest basic-wc failed. https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3133/fi-byt-n2820/igt@gem_mmap_gtt@basic-wc.html
Hence why using GTT is such a big performance hit on byt. This test is to enumerate that hw regression.
Raising priority since it's BAT test.
Please note this is a dup of bug 97942 and was moved to IGT component. Also note: https://bugs.freedesktop.org/show_bug.cgi?id=97942#c1 (In reply to Chris Wilson from comment #1) > Yes, expected failure for this *hardware*.
We are still hitting the same issue on BYT with: IGT-Version: 1.20-g1fc4de1 (x86_64) (Linux: 4.14.0-rc6-drm-intel-qa-ww44-commit-2badde8+ x86_64)
Never seen again. Closing
On QA BYT the issue still exists, not sure what's different. $ : time sudo -E ./gem_mmap_gtt --r basic-wc IGT-Version: 1.20-g9fe5a9a (x86_64) (Linux: 4.14.0-rc8-drm-intel-qa-ww45-commit-b911f67+ x86_64) (gem_mmap_gtt:6261) CRITICAL: Test assertion failure function test_wc, file gem_mmap_gtt.c:286: (gem_mmap_gtt:6261) CRITICAL: Failed assertion: gtt_writes > cpu_writes/2 (gem_mmap_gtt:6261) CRITICAL: Write-Combined writes are expected to be roughly equivalent to WB writes: WC (gtt)=2623.16MiB/s, WB (cpu)=5517.15MiB/s
Still present on QA with IGT-Version: 1.20-gf370d59 (x86_64) (Linux: 4.14.0-drm-intel-qa-ww46-commit-712af85+ x86_64)
Still there with IGT-Version: 1.20-gf8f6db9 (x86_64) (Linux: 4.14.0-drm-intel-qa-ww47-commit-f710441+ x86_64) (gem_mmap_gtt:14136) CRITICAL: Test assertion failure function test_wc, file gem_mmap_gtt.c:286: (gem_mmap_gtt:14136) CRITICAL: Failed assertion: gtt_writes > cpu_writes/2 (gem_mmap_gtt:14136) CRITICAL: Write-Combined writes are expected to be roughly equivalent to WB writes: WC (gtt)=2553.05MiB/s, WB (cpu)=5613.75MiB/s Subtest basic-wc failed.
IGT-Version: 1.20-g380cc81 (x86_64) (Linux: 4.15.0-rc1-drm-intel-qa-ww48-commit-0645c6d+ x86_64), same Failed assertion: gtt_writes > cpu_writes/2
Still failing, IGT-Version: 1.20-g1db1246 (x86_64) (Linux: 4.15.0-rc2-drm-intel-qa-ww49-commit-1a0d67e+ x86_64) Will try to bisect.
(In reply to Elizabeth from comment #10) > Still failing, IGT-Version: 1.20-g1db1246 (x86_64) (Linux: > 4.15.0-rc2-drm-intel-qa-ww49-commit-1a0d67e+ x86_64) > Will try to bisect. It's meant to fail. The HW didn't live up to expectations, the test is trying to document that and warn others not to use GTT.
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