Hi,

I am working with SLES12 and KDE and have some problem with its performance. After some time of using my servers desktop starts freezing for some time. This 'hanging' state holds for a few seconds where you can not interact at all. It is possible to move the cursor but thre is no reaction to any clicking action. After a few seconds you can continue working (sometimes it takes a few minutes). To find out more about this behaviour I did some monitoring and testing.

I found out that the hanging session doesn┤t affect any other running session. So I was able to create the hanging state while monitoring the system. During the hanging state there is no process that has a big CPU or RAM utilization. The only noticable parameter is the I/O utilization which is a bit higher than normal. The slightly higher I/O utilization was raised by the usage of a virtual machine or by copying big files. My suggestion is that it has something to do with I/O but I was not able to find any appropriate solution. I tried different I/O Schedulers and I used different kernels (default and desktop) but it didn┤t help at all.

Does anyone have similar problems while using SLES 12? Or anyone have an idea what can cause these behaviour?

Information about my system:
HP DESK800 G1 (8 i7 cores and 16 GB RAM)
SLES 12
KDE 4.14.9
Kernel: 3.12.39-47.2-default/desktop

System messages during a hanging state:

Code:
2015-08-12T08:44:00.307225+02:00 sles12server polkitd[7487]: Unregistered Authentication Agent for unix-session:97 (system bus name :1.278, object path /org/kde/PolicyKit1/AuthenticationAgent, locale de_DE.UTF-8)
2015-08-12T08:44:00.459266+02:00 sles12server kdm: sles12server.network.com:2[7415]: pam_unix(xdm:session): session closed for user engin
2015-08-12T08:44:00.460891+02:00 sles12server org.kde.kuiserver[7832]: kuiserver: Fatal IO error: client killed
2015-08-12T08:44:00.519656+02:00 sles12server pulseaudio[14680]: [pulseaudio] main.c: User-configured server at {6cfa6ca0c1a94310810d5adc33ef07ab}unix:/run/user/1001/pulse/native, which appears to be local. Probing deeper.
2015-08-12T08:44:00.519820+02:00 sles12server pulseaudio[14681]: [pulseaudio] main.c: User-configured server at {6cfa6ca0c1a94310810d5adc33ef07ab}unix:/run/user/1001/pulse/native, which appears to be local. Probing deeper.
2015-08-12T08:44:00.528713+02:00 sles12server pulseaudio[14686]: [pulseaudio] main.c: User-configured server at {6cfa6ca0c1a94310810d5adc33ef07ab}unix:/run/user/1001/pulse/native, which appears to be local. Probing deeper.
2015-08-12T08:44:00.533803+02:00 sles12server pulseaudio[14685]: [pulseaudio] pid.c: Stale PID file, overwriting.
2015-08-12T08:44:00.604295+02:00 sles12server rtkit-daemon[7587]: Supervising 0 threads of 0 processes of 1 users.
2015-08-12T08:44:00.611035+02:00 sles12server rtkit-daemon[7587]: message repeated 4 times: [ Supervising 0 threads of 0 processes of 1 users.]
2015-08-12T08:44:00.645451+02:00 sles12server xinetd[3757]: EXIT: vnc2 status=0 duration=635(sec)
2015-08-12T08:44:00.649710+02:00 sles12server rtkit-daemon[7587]: Supervising 0 threads of 0 processes of 1 users.
2015-08-12T08:44:00.664712+02:00 sles12server rtkit-daemon[7587]: message repeated 9 times: [ Supervising 0 threads of 0 processes of 1 users.]
2015-08-12T08:44:00.686168+02:00 sles12server pulseaudio[14693]: [pulseaudio] pid.c: Daemon already running.
2015-08-12T08:44:00.700595+02:00 sles12server pulseaudio[14695]: [pulseaudio] pid.c: Daemon already running.
2015-08-12T08:44:01.811863+02:00 sles12server xinetd[3757]: START: vnc2 from=10.49.80.121
2015-08-12T08:44:01.842077+02:00 sles12server kdm_config[14753]: Multiple occurrences of section [General] in /usr/share/kde4/config/kdm/kdmrc. Consider merging them.
2015-08-12T08:44:01.842251+02:00 sles12server kdm_config[14753]: Multiple occurrences of section [X-*-Core] in /usr/share/kde4/config/kdm/kdmrc. Consider merging them.
2015-08-12T08:44:01.842343+02:00 sles12server kdm_config[14753]: Multiple occurrences of section [X-*-Greeter] in /usr/share/kde4/config/kdm/kdmrc. Consider merging them.
2015-08-12T08:44:01.842434+02:00 sles12server kdm_config[14753]: Multiple occurrences of key 'Language' in section [X-*-Greeter] of /usr/share/kde4/config/kdm/kdmrc
2015-08-12T08:44:01.842499+02:00 sles12server kdm_config[14753]: Multiple occurrences of section [X-:*-Core] in /usr/share/kde4/config/kdm/kdmrc. Consider merging them.
2015-08-12T08:44:01.842534+02:00 sles12server kdm_config[14753]: Multiple occurrences of section [X-:0-Core] in /usr/share/kde4/config/kdm/kdmrc. Consider merging them.
2015-08-12T08:44:01.842560+02:00 sles12server kdm_config[14753]: Multiple occurrences of key 'AutoLoginEnable' in section [X-:0-Core] of /usr/share/kde4/config/kdm/kdmrc
2015-08-12T08:44:01.842584+02:00 sles12server kdm_config[14753]: Invalid option value 'engin,runtime1,runtime2,' at /usr/share/kde4/config/kdm/kdmrc:43
2015-08-12T08:44:09.571402+02:00 sles12server kdm: sles12server.network.com:2[14758]: pam_unix(xdm:session): session opened for user engin by (uid=0)
2015-08-12T08:44:09.575093+02:00 sles12server kernel: [59366.384312] type=1006 audit(1439361849.567:99): pid=14758 uid=0 old auid=4294967295 new auid=1001 old ses=4294967295 new ses=98 res=1
2015-08-12T08:44:10.866481+02:00 sles12server dbus[2092]: [system] Activating via systemd: service name='org.freedesktop.Avahi' unit='dbus-org.freedesktop.Avahi.service'
2015-08-12T08:44:10.866650+02:00 sles12server dbus[2092]: [system] Activation via systemd failed for unit 'dbus-org.freedesktop.Avahi.service': Unit dbus-org.freedesktop.Avahi.service failed to load: No such file or directory.
2015-08-12T08:44:11.945588+02:00 sles12server pulseaudio[15202]: Daemon already running.
2015-08-12T08:44:11.969167+02:00 sles12server pulseaudio[15217]: Daemon already running.
2015-08-12T08:44:12.150906+02:00 sles12server polkitd[7487]: Registered Authentication Agent for unix-session:98 (system bus name :1.307 [/usr/lib64/kde4/libexec/polkit-kde-authentication-agent-1], object path /org/kde/PolicyKit1/AuthenticationAgent, locale de_DE.UTF-8)
2015-08-12T08:44:36.079627+02:00 sles12server kdm[6712]: Cannot execute 'grub': not in $PATH.
2015-08-12T08:44:38.432537+02:00 sles12server polkitd[7487]: Unregistered Authentication Agent for unix-session:98 (system bus name :1.307, object path /org/kde/PolicyKit1/AuthenticationAgent, locale de_DE.UTF-8)
2015-08-12T08:44:38.524018+02:00 sles12server kdm: sles12server.network.com:2[14758]: pam_unix(xdm:session): session closed for user engin
2015-08-12T08:44:38.525990+02:00 sles12server org.kde.kuiserver[14940]: kuiserver: Fatal IO error: client killed
2015-08-12T08:44:38.532635+02:00 sles12server xinetd[3757]: EXIT: vnc2 status=0 duration=37(sec)
2015-08-12T08:45:01.975452+02:00 sles12server cron[15823]: pam_unix(crond:session): session opened for user root by (uid=0)
2015-08-12T08:45:01.978896+02:00 sles12server systemd: pam_unix(systemd-user:session): session opened for user root by (uid=0)
2015-08-12T08:45:01.979089+02:00 sles12server kernel: [59418.811463] type=1006 audit(1439361901.974:100): pid=15823 uid=0 old auid=4294967295 new auid=0 old ses=4294967295 new ses=99 res=1
2015-08-12T08:45:02.003593+02:00 sles12server CRON[15823]: pam_unix(crond:session): session closed for user root
2015-08-12T08:45:02.011844+02:00 sles12server systemd: pam_unix(systemd-user:session): session closed for user root
2015-08-12T08:45:29.324782+02:00 sles12server polkit-agent-helper-1[6425]: pam_unix(polkit-1:auth): authentication failure; logname= uid=1001 euid=0 tty= ruser=root rhost=  user=root
2015-08-12T08:45:30.064534+02:00 sles12server polkitd[7487]: Operator of unix-session:1 FAILED to authenticate to gain authorization for action org.kde.powerdevil.backlighthelper.brightness for system-bus-name::1.20 [kdeinit4: kded4 [kdeinit]] (owned by unix-user:engin)
2015-08-12T08:45:38.483931+02:00 sles12server su: pam_unix(su-l:session): session closed for user root
2015-08-12T08:45:38.484773+02:00 sles12server su: pam_unix(su-l:session): session closed for user root
2015-08-12T08:45:41.653196+02:00 sles12server kdm[6712]: Cannot execute 'grub': not in $PATH.
2015-08-12T08:45:43.089497+02:00 sles12server polkitd[7487]: Unregistered Authentication Agent for unix-session:1 (system bus name :1.51, object path /org/kde/PolicyKit1/AuthenticationAgent, locale de_DE.UTF-8)
2015-08-12T08:45:43.238199+02:00 sles12server kdm: :0[6786]: pam_unix(xdm:session): session closed for user engin
2015-08-12T08:45:43.239411+02:00 sles12server org.kde.kuiserver[7076]: kuiserver: Fatal IO error: client killed
2015-08-12T08:45:43.630643+02:00 sles12server kdm[6712]: plymouth should quit after server startup
2015-08-12T08:45:43.737326+02:00 sles12server kdm[6712]: Quitting Plymouth with transition
2015-08-12T08:45:43.739098+02:00 sles12server kdm[6712]: Is Plymouth still running? no
2015-08-12T08:45:49.805521+02:00 sles12server kdm: :0[16400]: pam_unix(xdm:session): session opened for user engin by (uid=0)
2015-08-12T08:45:49.807088+02:00 sles12server kernel: [59466.662710] type=1006 audit(1439361949.801:101): pid=16400 uid=0 old auid=4294967295 new auid=1001 old ses=4294967295 new ses=100 res=1
2015-08-12T08:45:50.684198+02:00 sles12server dbus[2092]: [system] Activating service name='org.kde.powerdevil.backlighthelper' (using servicehelper)
2015-08-12T08:45:50.694316+02:00 sles12server dbus[2092]: [system] Successfully activated service 'org.kde.powerdevil.backlighthelper'
2015-08-12T08:45:50.884569+02:00 sles12server dbus[2092]: [system] Activating via systemd: service name='org.freedesktop.Avahi' unit='dbus-org.freedesktop.Avahi.service'
2015-08-12T08:45:50.884744+02:00 sles12server dbus[2092]: [system] Activation via systemd failed for unit 'dbus-org.freedesktop.Avahi.service': Unit dbus-org.freedesktop.Avahi.service failed to load: No such file or directory.
2015-08-12T08:45:51.789625+02:00 sles12server pulseaudio[16795]: Daemon already running.
2015-08-12T08:45:51.817120+02:00 sles12server pulseaudio[16804]: Daemon already running.
2015-08-12T08:45:51.872413+02:00 sles12server pulseaudio[14685]: [pulseaudio] module.c: Module "module-device-manager" should be loaded once at most. Refusing to load.
2015-08-12T08:45:51.938634+02:00 sles12server polkitd[7487]: Registered Authentication Agent for unix-session:100 (system bus name :1.323 [/usr/lib64/kde4/libexec/polkit-kde-authentication-agent-1], object path /org/kde/PolicyKit1/AuthenticationAgent, locale de_DE.UTF-8)
2015-08-12T08:47:10.046677+02:00 sles12server kdm[6712]: Cannot execute 'grub': not in $PATH.
2015-08-12T08:47:11.873300+02:00 sles12server polkitd[7487]: Unregistered Authentication Agent for unix-session:100 (system bus name :1.323, object path /org/kde/PolicyKit1/AuthenticationAgent, locale de_DE.UTF-8)
2015-08-12T08:47:11.990168+02:00 sles12server kdm: :0[16400]: pam_unix(xdm:session): session closed for user engin
2015-08-12T08:47:11.991496+02:00 sles12server org.kde.kuiserver[16546]: kuiserver: Fatal IO error: client killed
2015-08-12T08:47:12.375519+02:00 sles12server kdm[6712]: plymouth should quit after server startup
2015-08-12T08:47:12.477523+02:00 sles12server kdm[6712]: Quitting Plymouth with transition
2015-08-12T08:47:12.479388+02:00 sles12server kdm[6712]: Is Plymouth still running? no
2015-08-12T08:47:21.676716+02:00 sles12server kdm: :0[17763]: pam_unix(xdm:session): session opened for user engin by (uid=0)
2015-08-12T08:47:21.679089+02:00 sles12server kernel: [59558.574473] type=1006 audit(1439362041.674:102): pid=17763 uid=0 old auid=4294967295 new auid=1001 old ses=4294967295 new ses=101 res=1
2015-08-12T08:47:22.564814+02:00 sles12server dbus[2092]: [system] Activating service name='org.kde.powerdevil.backlighthelper' (using servicehelper)
2015-08-12T08:47:22.576266+02:00 sles12server dbus[2092]: [system] Successfully activated service 'org.kde.powerdevil.backlighthelper'
2015-08-12T08:47:22.790270+02:00 sles12server dbus[2092]: [system] Activating via systemd: service name='org.freedesktop.Avahi' unit='dbus-org.freedesktop.Avahi.service'
2015-08-12T08:47:22.790435+02:00 sles12server dbus[2092]: [system] Activation via systemd failed for unit 'dbus-org.freedesktop.Avahi.service': Unit dbus-org.freedesktop.Avahi.service failed to load: No such file or directory.
2015-08-12T08:47:23.675522+02:00 sles12server pulseaudio[18183]: Daemon already running.
2015-08-12T08:47:23.689259+02:00 sles12server pulseaudio[14685]: [pulseaudio] module.c: Module "module-device-manager" should be loaded once at most. Refusing to load.
2015-08-12T08:47:23.713211+02:00 sles12server pulseaudio[18197]: Daemon already running.
2015-08-12T08:47:23.848383+02:00 sles12server polkitd[7487]: Registered Authentication Agent for unix-session:101 (system bus name :1.338 [/usr/lib64/kde4/libexec/polkit-kde-authentication-agent-1], object path /org/kde/PolicyKit1/AuthenticationAgent, locale de_DE.UTF-8)
2015-08-12T08:48:13.920593+02:00 sles12server su: (to root) engin on pts/4
2015-08-12T08:48:13.920789+02:00 sles12server su: pam_unix(su-l:session): session opened for user root by engin(uid=1001)
2015-08-12T08:49:06.555592+02:00 sles12server su: pam_unix(su-l:auth): authentication failure; logname=engin uid=1001 euid=0 tty=pts/7 ruser=engin rhost=  user=root
2015-08-12T08:49:08.698758+02:00 sles12server su: FAILED SU (to root) engin on pts/7
2015-08-12T08:49:20.795738+02:00 sles12server su: (to root) engin on pts/7
2015-08-12T08:49:20.795891+02:00 sles12server su: pam_unix(su-l:session): session opened for user root by engin(uid=1001)
2015-08-12T08:50:44.088924+02:00 sles12server su: (to root) engin on pts/6
2015-08-12T08:50:44.089086+02:00 sles12server su: pam_unix(su-l:session): session opened for user root by engin(uid=1001)