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2025-11-17 - 10:44
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Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rackeslot6.osadl.org (updated Mon Nov 17, 2025 00:44:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
29950729910088,9cyclictest3070895-21cat23:05:011
29950699910088,9cyclictest268544-21cups-browsed00:00:020
2995069999690,4cyclictest3030924-21kworker/u8:1+flush-179:021:00:260
2995069998764,20cyclictest271-21systemd-journal20:40:000
2995072998475,7cyclictest3093684-21latency_hist00:15:011
2995072998070,7cyclictest3017504-21latency_hist20:20:011
2995072997971,5cyclictest3030924-21kworker/u8:1+flush-179:021:05:261
2995072997560,13cyclictest3094988-21kworker/u8:2+events_unbound00:30:301
2995069997263,6cyclictest3059667-21/usr/sbin/munin22:30:280
2995069996933,27cyclictest3009628-21latency_hist19:55:020
2995072996459,3cyclictest723-21Xorg21:50:591
2995072996459,3cyclictest3059404-21kworker/u8:0+flush-179:022:30:181
2995072996255,5cyclictest3078247-21kworker/u8:1+flush-179:000:00:261
2995072996254,6cyclictest3028648-21latency_hist20:55:011
2995072996254,6cyclictest3023848-21kworker/u8:0+flush-179:021:30:001
2995069996250,10cyclictest271-21systemd-journal19:34:560
2995069996229,25cyclictest3056245-21turbostat22:24:550
2995072996055,3cyclictest3040577-21apt-get21:30:131
2995069995951,6cyclictest3037434-21diskstats21:20:190
2995069995854,2cyclictest0-21swapper/022:10:590
2995069995850,6cyclictest3084088-21apt-get23:45:150
2995072995737,18cyclictest3020951-21apt-get20:30:131
2995069995749,5cyclictest3016148-21kworker/u8:2+flush-179:020:25:270
2995069995749,5cyclictest3016148-21kworker/u8:2+flush-179:020:25:260
2995076995654,1cyclictest0-21swapper/319:48:593
2995072995651,4cyclictest3074020-21apt-get23:15:031
2995072995647,7cyclictest3000240-21/usr/sbin/munin19:25:241
2995069995650,3cyclictest3023848-21kworker/u8:0+flush-179:021:05:260
2995069995647,6cyclictest3001589-21latency_hist19:30:010
2995069995646,7cyclictest3059427-21latency_hist22:30:010
2995072995552,2cyclictest3060996-21kworker/u8:3+events_unbound22:45:011
2995072995552,2cyclictest3060996-21kworker/u8:3+events_unbound22:45:001
2995069995547,6cyclictest2999629-21kworker/u8:1+events_unbound19:40:000
2995069995543,9cyclictest3036618-21latency_hist21:20:010
2995072995450,3cyclictest3088790-21dpkg00:00:011
2995072995444,8cyclictest3067621-21/usr/sbin/munin22:55:271
2995073995350,2cyclictest0-21swapper/200:36:002
299507299531,31cyclictest0-21swapper/121:45:161
299507299530,34cyclictest3095551-21apt-get00:20:181
299507299530,34cyclictest3095551-21apt-get00:20:171
2995072995246,4cyclictest3053046-21kworker/u8:2+events_unbound22:20:011
2995072995242,8cyclictest3077465-21latency_hist23:25:001
2995069995246,4cyclictest3045138-21kworker/u8:0+flush-179:022:10:010
2995069995242,8cyclictest3006627-21apt-get19:45:130
2995069995233,17cyclictest3098472-21munin-run00:30:000
2995072995145,4cyclictest3072456-21kworker/u8:3+events_unbound23:15:011
2995069995133,17cyclictest3015942-21systemd-run20:15:010
2995069995127,22cyclictest3076081-21latency_hist23:20:010
2995076995047,2cyclictest0-21swapper/319:32:593
2995069995041,7cyclictest3062660-21kworker/u8:2+events_unbound23:40:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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