Bug 106375

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_49/fi-bdw-gvtdvm/igt@perf@enable-disable.html

(perf:1642) CRITICAL: Test assertion failure function test_enable_disable, file ../tests/perf.c:2609:
(perf:1642) CRITICAL: Failed assertion: (n_periodic_reports * report_size) > (report_size * n_full_oa_reports * 0.45)
Subtest enable-disable failed.

Also seen on SKL: https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_80/fi-skl-gvtdvm/igt@perf@enable-disable.html

(perf:1194) CRITICAL: Test assertion failure function test_enable_disable, file ../tests/perf.c:2613:
(perf:1194) CRITICAL: Failed assertion: (n_periodic_reports * report_size) > (report_size * n_full_oa_reports * 0.45)
Subtest enable-disable failed.(pe

Also seen is a slight different variant:

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_90/fi-bdw-gvtdvm/igt@perf@buffer-fill.html

(perf:1431) CRITICAL: Test assertion failure function test_buffer_fill, file ../tests/perf.c:2475:
(perf:1431) CRITICAL: Failed assertion: n_periodic_reports * report_size > report_size * n_full_oa_reports * 0.45
Subtest buffer-fill failed.

The test verifies enable/disable function of report generation into the OA buffer.

- Open a perf stream with report generation disabled
- Ensure that there are no reports generated for time duration that it takes to fill the entire buffer
- Enable report generation
- Wait for the half the OA buffer to be filled (based on report periodicity, report size and OA buffer size)
- Read all reports generated until the delta between first and the last read report matches half the time taken to fill the entire OA buffer.
- Make sure that the number of reports generated is within 45% to 55% of the expected number of reports.

The failure is that the number of reports do not fall in this range.

Machines affected: skl and bdw
Repro rate: 0.6%

The test seems to ignore spurious reports and hence falls short of 45% by 10 - 15 reports. Test logic must be updated to reflect spurious reports by checking if the timestamp delta between the previous and current reports is greater than the periodic interval.

Severity: Low
Priority: Medium

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