[Bug 106375] [CI] igt at perf@* - fail - Failed assertion: n_periodic_reports * report_size > report_size * n_full_oa_reports * 0.45

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106375

--- Comment #4 from umesh <umesh.nerlige.ramappa at intel.com> ---
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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