Public bug reported:
Using Mir 0.26.1, Unity8 runs better than ever. But when displaying a
large continuously rendering window (e.g. eglplasma or egltriangle), the
Unity8 shell hiccups and visually stutters exactly every 5 seconds.
According to MIR_CLIENT_PERF_REPORT it's quite major, missing somewhere
around 9 frames every 5 seconds. This matches what I see on screen - a
large number of frames skipped once every five seconds...
[2017-02-13 16:16:26.761602] perf: : 60.00 FPS, render time 0.41ms, buffer lag
66.31ms (4 buffers)
[2017-02-13 16:16:27.762435] perf: : 60.00 FPS, render time 0.39ms, buffer lag
66.32ms (4 buffers)
[2017-02-13 16:16:28.763269] perf: : 51.00 FPS, render time 0.39ms, buffer lag
78.10ms (4 buffers)
[2017-02-13 16:16:29.764068] perf: : 60.00 FPS, render time 0.39ms, buffer lag
66.32ms (4 buffers)
[2017-02-13 16:16:30.764939] perf: : 60.00 FPS, render time 0.38ms, buffer lag
66.33ms (4 buffers)
[2017-02-13 16:16:31.765773] perf: : 60.00 FPS, render time 0.39ms, buffer lag
66.32ms (4 buffers)
[2017-02-13 16:16:32.766603] perf: : 60.00 FPS, render time 0.39ms, buffer lag
66.32ms (4 buffers)
[2017-02-13 16:16:33.767437] perf: : 51.00 FPS, render time 0.38ms, buffer lag
78.10ms (4 buffers)
[2017-02-13 16:16:34.768274] perf: : 60.00 FPS, render time 0.39ms, buffer lag
66.32ms (4 buffers)
[2017-02-13 16:16:35.769109] perf: : 60.00 FPS, render time 0.39ms, buffer lag
66.32ms (4 buffers)
[2017-02-13 16:16:36.769943] perf: : 60.00 FPS, render time 0.39ms, buffer lag
66.32ms (4 buffers)
[2017-02-13 16:16:37.770780] perf: : 60.00 FPS, render time 0.39ms, buffer lag
66.32ms (4 buffers)
[2017-02-13 16:16:38.771629] perf: : 51.00 FPS, render time 0.40ms, buffer lag
78.09ms (4 buffers)
[2017-02-13 16:16:39.772446] perf: : 60.00 FPS, render time 0.39ms, buffer lag
66.32ms (4 buffers)
[2017-02-13 16:16:40.773279] perf: : 60.00 FPS, render time 0.39ms, buffer lag
66.32ms (4 buffers)
[2017-02-13 16:16:41.774111] perf: : 60.00 FPS, render time 0.39ms, buffer lag
66.32ms (4 buffers)
[2017-02-13 16:16:42.774944] perf: : 60.00 FPS, render time 0.39ms, buffer lag
66.32ms (4 buffers)
[2017-02-13 16:16:43.775796] perf: : 51.00 FPS, render time 0.38ms, buffer lag
78.10ms (4 buffers)
[2017-02-13 16:16:44.776615] perf: : 60.00 FPS, render time 0.36ms, buffer lag
66.35ms (4 buffers)
[2017-02-13 16:16:45.777448] perf: : 60.00 FPS, render time 0.39ms, buffer lag
66.33ms (4 buffers)
[2017-02-13 16:16:46.778282] perf: : 60.00 FPS, render time 0.39ms, buffer lag
66.33ms (4 buffers)
[2017-02-13 16:16:47.779135] perf: : 60.00 FPS, render time 0.39ms, buffer lag
66.32ms (4 buffers)
[2017-02-13 16:16:48.779969] perf: : 51.00 FPS, render time 0.39ms, buffer lag
78.09ms (4 buffers)
[2017-02-13 16:16:49.780801] perf: : 60.00 FPS, render time 0.39ms, buffer lag
66.32ms (4 buffers)
[2017-02-13 16:16:50.781639] perf: : 60.00 FPS, render time 0.39ms, buffer lag
66.32ms (4 buffers)
** Affects: canonical-devices-system-image
Importance: High
Status: New
** Affects: mir
Importance: High
Status: New
** Affects: qtmir (Ubuntu)
Importance: High
Status: New
** Affects: unity8 (Ubuntu)
Importance: High
Status: New
** Tags: performance unity8-desktop
** Also affects: mir
Importance: Undecided
Status: New
** Also affects: qtmir (Ubuntu)
Importance: Undecided
Status: New
** Changed in: mir
Importance: Undecided => High
** Changed in: qtmir (Ubuntu)
Importance: Undecided => High
** Also affects: canonical-devices-system-image
Importance: Undecided
Status: New
** Changed in: canonical-devices-system-image
Importance: Undecided => High
** Tags added: unity8-desktop
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https://bugs.launchpad.net/bugs/1664150
Title:
[performance] Unity8 rendering hiccups/stutters exactly every 5
seconds
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