** Changed in: canonical-devices-system-image
Importance: Undecided => High
** Changed in: canonical-devices-system-image
Status: New => Confirmed
** Changed in: canonical-devices-system-image
Assignee: (unassigned) => Michał Sawicz (saviq)
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Touch seeded packages, which is subscribed to unity8 in Ubuntu.
https://bugs.launchpad.net/bugs/1564721
Title:
Unity8-dash render time is too high, causing frame skipping
Status in Canonical System Image:
Confirmed
Status in unity8 package in Ubuntu:
Confirmed
Bug description:
Unity8-dash render time is too high, causing frame skipping
On a 60Hz display you have 16.6ms per frame. So to keep things running
smoothly your render time should be much lower than 16.6ms.
$ restart unity8-dash MIR_CLIENT_PERF_REPORT=log
MIR_CLIENT_FORCE_SWAP_INTERVAL=0
$ tail -f ~/.cache/upstart/unity8-dash.log
MAKO:
[2016-04-01 11:38:54.086901] perf: : 69.00 FPS, render time 13.96ms, buffer
lag 29.76ms (3 buffers)
[2016-04-01 11:38:55.103637] perf: : 73.81 FPS, render time 13.00ms, buffer
lag 27.33ms (3 buffers)
[2016-04-01 11:38:56.111953] perf: : 67.46 FPS, render time 14.19ms, buffer
lag 30.60ms (3 buffers)
ARALE:
[2016-04-01 11:41:43.467067] perf: : 52.31 FPS, render time 18.54ms, buffer
lag 61.60ms (3 buffers)
[2016-04-01 11:41:44.491750] perf: : 53.71 FPS, render time 18.01ms, buffer
lag 37.43ms (3 buffers)
[2016-04-01 11:41:45.504621] perf: : 55.33 FPS, render time 17.53ms, buffer
lag 37.03ms (3 buffers)
Note(1): I have used MIR_CLIENT_FORCE_SWAP_INTERVAL=0 because it works
around a problem with the Android platform's
MIR_CLIENT_PERF_REPORT=log being rounded up to the next frame
interval. It also has the nice benefit of showing peak frame rate
possible on a device (e.g. 73 FPS on mako above).
Note(2): Yes you can use the same benchmark on 'unity8' instead of
'unity8-dash' however the results will be inaccurate -- limited and
rounded to whole frames due to bug 1369763.
Note(3): This is all possibly related to bug 1494795.
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