[Bug 111090] 3% perf drop in GfxBench Manhattan 3.0, 3.1 and CarChase test-cases

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111090

--- Comment #1 from Chris Wilson <chris at chris-wilson.co.uk> ---
Note that

commit 8ee36e048c98d4015804a23f884be2576f778a93
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Jun 20 15:20:52 2019 +0100

    drm/i915/execlists: Minimalistic timeslicing

    If we have multiple contexts of equal priority pending execution,
    activate a timer to demote the currently executing context in favour of
    the next in the queue when that timeslice expires. This enforces
    fairness between contexts (so long as they allow preemption -- forced
    preemption, in the future, will kick those who do not obey) and allows
    us to avoid userspace blocking forward progress with e.g. unbounded
    MI_SEMAPHORE_WAIT.

is at least one intentional change in the scheduling that may interfere with
throughput tests (like gfxbench) in the presence of third parties (X) also
trying to render.

Except that is nowhere need the mentioned commits -- so I will have to check,
but if you could keep an eye out for any potential regression from that (such
need to be minimised and find some justification).

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