[Mir] [performance] Scrolling is jumpy on manta

[Omer Akram]

1. Open browser app and go to omgubuntu.co.uk
2. Do a quick flick from bottom to top so that the page scrolls down
3. Note the not-so-smooth scrolling.
4. Now repeat the same thing with SurfaceFlinger, scrolling is smooth like ice.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: libmirplatform 0.0.15+13.10.20131014-0ubuntu1
Uname: Linux 3.4.0-3-mako armv7l
ApportVersion: 2.12.5-0ubuntu2
Architecture: armhf
Date: Thu Oct 17 12:50:34 2013
InstallationDate: Installed on 2013-10-17 (0 days ago)
InstallationMedia: Ubuntu 13.10 - armhf (20131017)
MarkForUpload: True
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
SourcePackage: mir
UpgradeStatus: No upgrade log present (probably fresh install)

[Dave Morley (davmor2)]

The attached file show the drawing lag on a fast scroll and the juddering effect on a slow scroll

[Omer Akram (om26er)]

General scrolling unity8 itself is smooth but if you have multiple apps running and you scroll in the dash you can note a clear jumpy scrolling behavior there as well. but that may as well be related to bug 1227739

[Daniel van Vugt (vanvugt)]

Yeah sounds like it might be solved with bug 1227739. Unfortunately for mako that also depends on bug 1240833 being resolved.

[Pat McGowan (pat-mcgowan)]

This same symptom is currently visible on the manta.
r55

[Pat McGowan (pat-mcgowan)]

The dash is also quite jumpy, or example the Applications with all the suggestions exposed.

[kevin gunn (kgunn72)]

@duflu - wrt what pat's reporting, when you get to the point in your measuring activity could you also measure specifically web page scroll, and "loaded" dash scroll

[Daniel van Vugt (vanvugt)]

The first step should probably be to land all the optimizations we have in progress. What remains is bug 1227739, which still requires platform-api work.

I've only just got my own "manta" so will look to see if there are any obvious performance problems in Mir holding it back. One such issue I can think of is that our Android "fence" support is not yet complete. I don't really understand that stuff but know it's on kdub's list of things to do.

[Daniel van Vugt (vanvugt)]

Omer,

Do you think this is the same as bug 1270245?

[kevin gunn (kgunn72)]

i do think so, duping