[Bug 105157] [CI] igt at perf_pmu@busy-accuracy-* - fail - Failed assertion: (double)(busy_r) <= (1.0 + (0.15)) * (double)((double)target_busy_pct / 100.0) && (double)(busy_r) >= (1.0 - (0.15)) * (double)((double)target_busy_pct / 100.0)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105157

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|REOPENED                    |RESOLVED

--- Comment #23 from Chris Wilson <chris at chris-wilson.co.uk> ---
Once more into the breach,

commit 1754cbd35005605a80b06d808b4f891555a151cd
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Aug 8 14:20:26 2018 +0100

    igt/perf_pmu: Aim for a fixed number of iterations for calibrating accuracy

    Our observation is that the systematic error is proportional to the
    number of iterations we perform; the suspicion is that it directly
    correlates with the number of sleeps. Reduce the number of iterations,
    to try and keep the error in check.

    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
    Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

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