A couple of comments. I've actually been chasing down a DBus performance issue on touch since mid-Summer, related to NetworkManager and WiFi scanning.
The high-level summary is that we have a number of system processes listening for NM AccessPoint DBus signals on specific AccessPoint DBus objects, and never cleaning up the associated DBus watch rules when the access points are removed. This can lead to a single processing adding 5k match rules to the system bus if WiFi is enabled long enough. For details see bug #1480877, an in particular from the following comment onwards: https://bugs.launchpad.net/ubuntu-rtm/+source/sync- monitor/+bug/1480877/comments/65 I've traced what I think is the cause to the bearer mgmt networkmanager plugin and am attempting to patch it. Note, this bug that I'm now adding this comment to, is about a confined app's usage of QNetworkSession. I should remind folks that there are a number of system processes ( eg. unity8 ) that either use QNetworkSession directly, or via QNetworkAccessManager, so we'll need to be careful we don't break anything if we decide to deprecate the networkmanager backend in favor of a connectivity API based backend. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apparmor-easyprof-ubuntu in Ubuntu. https://bugs.launchpad.net/bugs/1404188 Title: QNetworkSession::isOpen() always returns false Status in Canonical System Image: Confirmed Status in apparmor-easyprof-ubuntu package in Ubuntu: Confirmed Status in qtbase-opensource-src package in Ubuntu: Confirmed Bug description: Using QNetworkSession::isOpen() in confined apps on a phone running vivid always returns false. This might be an apparmor thing, however, I couldn't find any REJECTED entries in log files. The test app in lp:~mzanetti/+junk/nmsessiontest can reproduce the issue. Open this project in ubuntu-sdk's qtcreator and run it on a vivid device. Press the button and watch the debug prints. On a vivid-desktop or a RTM based phone it will print "all is well". On a vivid phone however, it'll print "network session not open..." This used to work fine at least back in utopic images. To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1404188/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
