Plasma-desktop becoming very slow

[Stephan Diestelhorst]

Am Freitag 08 Juni 2012, 09:49:55 schrieb Kevin Krammer:
> On Friday, 2012-06-08, Stephan Diestelhorst wrote:
> > Hi,
> >   after leaving my system running for a while with virtuoso-t eating
> > some CPU, virtuoso-t eventually finishes and everything is fine.
> > 
> > However, although the CPU load stays very low, plasma-desktop is
> > *very* slow.  Clicking on the virtual desktops in the bar will switch
> > the desktop after sevaral minutes(!), and the list of windows is not
> > really updated.  Also, Alt + F2 takes approx. 45 secs to open the
> > krunner dialog.
> > 
> > Switching desktops with Ctrl + F1 is fast and the respective
> > applications work fine, too.
> > 
> > This is on Kubuntu 11.10 with KDE 4.8.2.
> > 
> > Any ideas how to fix this?
> 
> I think I see this occasionally, usually after a tray icon got animated for a 
> longer time.
> 
> Restarting plasma-desktop works for me, i.e.
> I type this on a shell
> kquitapp plasma-desktop
> 
> and then ALT+F2 and type plasma-desktop

Yes, that sounds reasonable.  However, that does not help and
plasma-desktop takes ages to start.   Looking into plasma-desktop with
strace shows the following line is repeated over and over again:

16653 poll([{fd=5, events=POLLIN}], 1, 14485) = 1 ([{fd=5, revents=POLLIN}])
16653 recvmsg(5, {msg_name(0)=NULL, msg_iov(1)=[{"l\4\1\1\0\0\0\0\241w\2\0n\0\0\0\1\1o\0\23\0\0\0/StatusNotifierItem\0\0\0\0\0\2\1s\0\32\0\0\0org.kde.StatusNotifierItem\0\0\0\0\0\0\3\1s\0\n\0\0\0NewToolTip\0\0\0\0\0\0\7\1s\0\5\0\0\0:1.37\0\0\0desktop.DBus\0\0\0\0\10\1g\0\3sss\0\0\0\0\0\0\0\0\10\0\0\0:1.75805\0\0\0\0\10\0\0\0:1.75805\0\0\0\0\0\0\0\0\0\0per\0\0\0\0\0\0\0\22\0\0\0applications-other\0\0\5\0\0\0Apper\0\0\0Y\0\0\0Distribution upgrade available<br/><b>precise 12.04 LTS</b><br/>The latest stable release\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0Steuerprogramm f\303\274r Nepomuk\0\0\0\0\0\n\0\0\0ItemIsMenu\0\1b\0\0\0\0\0\0\0\4\0\0\0Menu\0\1o\0\10\0\0\0/MenuBar\0\0\0\0\0\0\0\0\17\0\0\0OverlayIconName\0\1s\0\0\0\0\0\0\0\0\0\0\21\0\0\0OverlayIconPixmap\0\7a(iiay)\0\0"..., 2048}], m
 sg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 128
16653 recvmsg(5, 0x7fff7e8fb600, MSG_CMSG_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)

with the exact text changing every now and then. (Ressembling the
notifications I just recevied, or just will recevie in the
notification area.)

The file descriptor 5 is a unix socket, which (after guessing with
consecutive socket IDs) connects to dbus-daemon.

Stephan
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