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OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #4

Rack #0/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #1/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #2/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #3/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #4/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #5/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #6/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #7/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #8/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #9/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #a/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #b/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #c/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #d/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #e/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #f/#0 #1 #2 #3 #4 #5 #6 #7 #8 
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Click here to display the system's profile data or here to proceed to next system.
Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

Data to construct the above plot have been generated using the RT test utility cyclictest.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rackeslot4s.osadl.org (updated Fri Jan 23, 2026 00:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
868519994640,4cyclictest252-21systemd-journal19:20:003
868515994238,3cyclictest819903-21kworker/u8:2+flush-259:020:00:002
868515994237,3cyclictest894456-21/usr/sbin/munin19:35:142
868505994034,4cyclictest1038497-21ntpq21:50:210
868505993935,3cyclictest1007958-21apt-get21:24:190
868505993933,4cyclictest971903-21kworker/u8:1+flush-259:021:30:000
868512993832,4cyclictest1034400-21cat21:50:001
868505993732,3cyclictest936080-21/usr/sbin/munin20:15:160
868505993632,2cyclictest950867-21kworker/u8:2+events_unbound22:37:400
868519993532,2cyclictest883532-21kworker/u8:3+flush-259:019:40:213
868505993528,5cyclictest1050165-21latency_hist22:05:000
868519993329,3cyclictest930444-21kworker/u8:0+flush-259:021:40:213
868505993329,3cyclictest819903-21kworker/u8:2+events_unbound19:15:170
868512993225,5cyclictest924208-21ntpq20:00:211
868512993225,5cyclictest252-21systemd-journal22:50:011
868505993229,2cyclictest211rcuc/021:20:000
868512993126,3cyclictest967005-21apt-get20:45:111
868505993125,5cyclictest1070792-21latency_hist22:25:010
868505993027,2cyclictest819903-21kworker/u8:2+flush-259:019:30:140
868505993026,3cyclictest1112273-21kworker/u8:3+events_unbound23:25:190
868519992923,4cyclictest925233-21gpgv20:05:013
868515992925,3cyclictest509-21rs:main2
868515992925,2cyclictest858315-21kworker/u8:0+events_unbound19:20:182
868519992825,2cyclictest1164073-21kworker/u8:3+flush-259:000:35:013
868519992823,3cyclictest950867-21kworker/u8:2+flush-259:021:04:593
868512992825,2cyclictest819903-21kworker/u8:2+flush-259:019:15:001
868512992825,2cyclictest819903-21kworker/u8:2+flush-259:019:15:001
868512992824,3cyclictest252-21systemd-journal21:25:001
868512992823,3cyclictest1127510-21kworker/u8:2+flush-259:023:50:001
868519992723,3cyclictest1055326-21kworker/u8:0+events_unbound22:50:183
868512992721,4cyclictest1023834-21apt-get21:40:121
868519992620,4cyclictest1127510-21kworker/u8:2+flush-259:023:45:213
868515992622,3cyclictest1148303-21kworker/u8:1+flush-259:000:15:002
868505992622,3cyclictest1164073-21kworker/u8:3+events_unbound00:15:140
868505992621,4cyclictest1059612-21ntpq22:10:220
86850599260,24cyclictest1-21systemd20:59:390
868519992519,4cyclictest252-21systemd-journal22:10:003
868515992522,2cyclictest819903-21kworker/u8:2+flush-259:019:45:202
868515992520,3cyclictest252-21systemd-journal23:40:002
86850599250,24cyclictest935860-21true20:15:000
868519992419,3cyclictest904542-21kworker/u8:1+flush-259:019:55:163
868519992417,5cyclictest1137856-21http23:30:003
868515992418,4cyclictest940988-21latency_hist20:20:012
868505992421,2cyclictest819903-21kworker/u8:2+flush-259:020:05:200
868519992316,5cyclictest252-21systemd-journal00:09:593
868515992319,3cyclictest950867-21kworker/u8:2+flush-259:021:40:002
868515992319,3cyclictest950867-21kworker/u8:2+events_unbound23:00:172
868515992318,4cyclictest934945-21ntpq20:10:242
868515992318,3cyclictest925113-21latency_hist20:05:022
868515992318,3cyclictest252-21systemd-journal00:05:002
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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