[Bug 77436] KDE Konsole very slow scrolling with TearFree and QT graphics system native

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77436

--- Comment #141 from Chris Wilson <chris at chris-wilson.co.uk> ---
I've restored the throttling and tried to compromise to not over-throttle
during allocations:

commit ca0d06add926eb17fcec6c031adabb656498d744
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Jun 25 14:19:33 2014 +0100

    sna: Improve throttling during bo allocation

    By controlling how long we may block during buffer allocation, we can
    relax the throttle elsewhere to prevent render lag buildup.

    References: https://bugs.freedesktop.org/show_bug.cgi?id=77436
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>


Can you please check that prevents the lag buildup on both TearFree and
non-TearFree setups?

Due to the well flips are scheduled in TearFree there can easily be a 20ms
delay between render and seeing the results, at best 16ms. That should be
enough to make non-TearFree feel snappier. To improve, I would need to submit
the next frame just before the vblank to minimise the render output latency.
The current solution is nice for its simplicity. :)

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