[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 #131 from Chris Wilson <chris at chris-wilson.co.uk> ---
That's mostly 60fps, with a few periods where it dropped to 32ms and even 48ms
between the flip-request and the actual flip.

14338.924991: render=0.0165519999991375 fps=60.092542514884
14338.941653: render=0.0166360000002896 fps=60.0168047053296
14338.958318: render=0.0166340000014316 fps=60.0060005964152
14338.974979: render=0.0166399999998248 fps=60.0204069395908
14339.008323: render=0.0333019999998214 fps=29.9904030714778
14339.058291: render=0.0499429999999847 fps=20.0128081975053
14339.074952: render=0.0166440000011789 fps=60.0204069330379
14339.091615: render=0.0166379999991477 fps=60.0132029099832
14339.108294: render=0.016658999998981 fps=59.955632830645
14339.124943: render=0.016631000000416 fps=60.0636674837393
14339.141607: render=0.016646000000037 fps=60.0096015403702
14339.158289: render=0.0166600000011385 fps=59.944850732613
14339.174930: render=0.0166149999986374 fps=60.0925425214526
14339.191595: render=0.0166370000006282 fps=60.0060005964152
14339.224940: render=0.0330740000008518 fps=29.9895036738702
14339.274915: render=0.0470879999993485 fps=20.0100050025397
14339.291575: render=0.0166399999998248 fps=60.0240096062931
14339.324906: render=0.03326399999969 fps=30.0021001465206
14339.341564: render=0.0166119999994407 fps=60.0312162307778
14339.358221: render=0.016631000000416 fps=60.0348201952704
14339.374882: render=0.0166349999999511 fps=60.0204069395908
14339.391549: render=0.0166420000005019 fps=59.9988000244664
14339.408213: render=0.0165100000012899 fps=60.0096015338197
14339.441539: render=0.0333039999986795 fps=30.0066014533538
14339.491547: render=0.0498279999992519 fps=19.9968005118534
14339.508191: render=0.00871700000061537 fps=60.0817111228772
14339.524856: render=0.016646000000037 fps=60.0060006029649
14339.558187: render=0.0332960000014282 fps=30.0021001465206
14339.574842: render=0.0102200000001176 fps=60.0420294225921


Which says that the slowdown is due to the GPU load and not latency in
preparing the next flip.

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