Confirmed for 14.04 trusty. – Better visible on the CPU impact on compiz.
The bug is: panel-updates (seconds on the clock, or system monitor multiload) use excessive CPU with unity. Netbook CPUs like Atom N270 need 5% for that... :-( -- You received this bug notification because you are a member of DX Packages, which is subscribed to unity in Ubuntu. Matching subscriptions: dx-packages https://bugs.launchpad.net/bugs/813409 Title: unity-panel-service uses CPU constantly when indicator-datetime is displaying seconds. Status in Unity: Triaged Status in “unity” package in Ubuntu: Triaged Bug description: unity-panel-service is using a constant 1% of one of my cores on an Intel i7-2600 according to top, while the desktop is totally idle. When I switch to another VT, it makes no difference and unity-panel- service just keeps using the CPU. This obviously should not happen and will impact on battery life of notebooks. Also, using the CPU constantly negates the power-saving benefits of a tickless Linux kernel (http://www.lesswatts.org/projects/tickless/). Update: Found the cause to be that my indicator-datetime is set to display seconds, not just hours and minutes. This seems to cause unity/compiz to send the SyncOne and SyncGeometries dbus messages to unity-panel-service every second. And profiling unity-panel-service with callgrind shows it is spending all it's time in g_variant_ fuctions, invoked by the dbus activity. So this needs to be optimized. It's quite wrong that something happening only once per second should use so much CPU. ProblemType: Bug DistroRelease: Ubuntu 11.04 Package: unity 3.8.16-0ubuntu1~natty1 ProcVersionSignature: Ubuntu 2.6.38-10.46-generic 2.6.38.7 Uname: Linux 2.6.38-10-generic x86_64 NonfreeKernelModules: fglrx Architecture: amd64 CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,vpswitch,place,imgpng,regex,unitymtgrabhandles,grid,session,snap,mousepoll,resize,move,animation,expo,ezoom,workarounds,resizeinfo,wall,staticswitcher,fade,scale,unityshell] Date: Wed Jul 20 17:34:24 2011 InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1) ProcEnviron: LANGUAGE=en_AU:en LANG=en_AU.UTF-8 SHELL=/bin/bash SourcePackage: unity UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/813409/+subscriptions -- Mailing list: https://launchpad.net/~dx-packages Post to : dx-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~dx-packages More help : https://help.launchpad.net/ListHelp
