** Also affects: mir (Ubuntu)
Importance: Undecided
Status: New
** Changed in: mir (Ubuntu)
Status: New => Invalid
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Touch seeded packages, which is subscribed to mir in Ubuntu.
https://bugs.launchpad.net/bugs/1476201
Title:
Dynamic double buffering fails to detect inertial dash scrolling as
slow; and stutters instead of scaling up to triple buffers.
Status in Mir:
In Progress
Status in Mir 0.15 series:
Triaged
Status in QtMir:
Opinion
Status in mir package in Ubuntu:
Invalid
Status in qtmir package in Ubuntu:
Opinion
Bug description:
Dynamic double buffering fails to detect inertial dash scrolling as
slow; and stutters...
[1437388267.960199] perf: Scopes: 37.69 FPS, render time 17.79ms, buffer lag
34.87ms (2 buffers)
[1437388268.985012] perf: Scopes: 30.27 FPS, render time 25.22ms, buffer lag
40.29ms (2 buffers)
[1437388269.993894] perf: Scopes: 31.74 FPS, render time 23.42ms, buffer lag
40.46ms (2 buffers)
[1437388271.002470] perf: Scopes: 36.70 FPS, render time 19.13ms, buffer lag
35.59ms (2 buffers)
[1437388272.021942] perf: Scopes: 44.16 FPS, render time 15.96ms, buffer lag
29.12ms (2 buffers)
[1437388273.043734] perf: Scopes: 40.15 FPS, render time 17.85ms, buffer lag
31.90ms (2 buffers)
whereas forcing triple buffers it runs more smoothly:
[1437389981.872839] perf: Scopes: 57.71 FPS, render time 13.86ms, buffer lag
38.31ms (3 buffers)
[1437389982.877556] perf: Scopes: 56.77 FPS, render time 15.72ms, buffer lag
37.31ms (3 buffers)
[1437389983.887702] perf: Scopes: 57.42 FPS, render time 13.53ms, buffer lag
38.76ms (3 buffers)
[1437389984.894372] perf: Scopes: 55.66 FPS, render time 16.02ms, buffer lag
38.12ms (3 buffers)
[1437389985.912328] perf: Scopes: 60.96 FPS, render time 13.72ms, buffer lag
34.99ms (3 buffers)
[1437389986.929857] perf: Scopes: 59.98 FPS, render time 14.49ms, buffer lag
35.67ms (3 buffers)
You can see that unity8-dash is right on the edge here.
Surprisingly the problem is not detectable if you keep your finger on
the screen. Then the dash actually renders faster. The problem only
seems to happen with inertial scrolling; when you fling the surface
and lift your finger off.
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