[Bug 105286] [CI] igt at perf_pmu@busy-vcs0 - fail - Failed assertion: (double)(val) <= (1.0 + (tolerance)) * (double)(flags & (1) ? slept : 0.f) && (double)(val) >= (1.0 - (tolerance)) * (double)(flags & (1) ? slept : 0.f)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105286

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

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

--- Comment #1 from Chris Wilson <chris at chris-wilson.co.uk> ---
We think this should be fixed by

commit d502f055ac4500cada758876a512ac4f14b34851
Author: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Date:   Wed Apr 4 10:51:52 2018 +0100

    tests/perf_pmu: Avoid RT thread for accuracy test

    Realtime scheduling interferes with execlists submission (tasklet) so try
    to simplify the PWM loop in a few ways:

     * Drop RT.
     * Longer batches for smaller systematic error.
     * More truthful test duration calculation.
     * Less clock queries.
     * No self-adjust - instead just report the achieved cycle and let the
       parent check against it.
     * Report absolute cycle error.

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