[Bug 105483] [CI][SHARDS] igt at perf@oa-exponents - fail - Test assertion failure function test_oa_exponents - Failed assertion: n_timer_reports - 3 <= matches - error: 27 > 26

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105483

--- Comment #11 from umesh <umesh.nerlige.ramappa at intel.com> ---
The test verifies different sample rates to capture reports into the OA buffer.
Rates range approx. from 3.33 us to 109 ms. Every iteration is double the
previous rate. Once 30 reports are captures, the timestamp delta between
reports is expected to be equal to the sample rate. A tolerance of 3 errors in
timestamp deltas (in a total of 29 deltas collected) is allowed.

A quick repro on APL suggests that the tolerance of 3 error deltas is a magic
number. Changing it to 4 increases the tolerance for the mismatches on
platforms like APL and allows the test to pass.

Machines: apl
Overall Repro rate: 22%

User Impact: None
Severity: Low
Pririty: Low

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