[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 #133 from Chris Wilson <chris at chris-wilson.co.uk> ---
The big difference is that on this machine I haven't been able to saturate the
GPU at 100% busy let alone 100% busy at max frequency. It's only an Ivybridge
Celeron with GT1 graphics, so not a powerhouse, but on the other hand only
1366x768.

Looking through the trace-cmd, I still haven't had that eureka moment of
spotting the beginning of the snowball, let alone understand the cause. There
are some long throttling periods which corresponds to the low framerate, but
the commands running up to those do not look absurd. There is the tendency for
the batch buffer size to grow when loaded, as expected though, and I don't
think scary.

What I do see though is that I perhaps neutered the regular throttling too
much.
So, 

commit 5ad1661b870b5b189e52383e45a9b8f570b40501
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Jun 25 13:21:58 2014 +0100

    sna: Only mark throttle as done after success

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

should be a step in the right direction.

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