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2026-04-03 - 07:28
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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 Fri Apr 03, 2026 00:44:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
157526199129119,8cyclictest1656869-21apt-get23:25:031
157525699117108,7cyclictest1668282-40mandb00:00:000
15752619910293,7cyclictest1656980-21gpgv23:25:011
1575256999993,4cyclictest1591106-21kworker/u8:3+events_unbound20:20:010
1575256999993,4cyclictest1591106-21kworker/u8:3+events_unbound20:20:010
1575261999686,7cyclictest1652072-21latency_hist23:10:021
1575256999688,6cyclictest1620016-21kworker/u8:0+flush-179:021:40:010
1575256999185,5cyclictest1604094-21kworker/u8:0+events_unbound21:10:240
1575256998981,6cyclictest1620016-21kworker/u8:0+flush-179:021:30:260
1575256998980,6cyclictest1648880-21latency_hist23:00:020
1575256998878,8cyclictest1561150-21kworker/u8:1+flush-179:019:15:000
1575261998777,8cyclictest266-21systemd-journal21:45:011
1575256998679,4cyclictest1666911-21kworker/u8:0+events_unbound00:05:240
1575256998377,4cyclictest1561150-21kworker/u8:1+events_unbound19:20:150
1575256998375,6cyclictest1655312-21kworker/u8:2+events_unbound23:45:020
1575256998277,4cyclictest1597397-21kworker/u8:0+flush-179:020:25:260
1575261998166,12cyclictest1637487-21latency_hist22:25:001
1575256998175,4cyclictest1640902-21kworker/u8:2+flush-179:022:50:200
1575261998073,6cyclictest1594220-21kworker/u8:2+flush-179:021:25:261
1575256997973,4cyclictest1668311-21kworker/u8:3+flush-179:000:10:210
1575256997972,4cyclictest1660543-21apt-get23:35:110
1575256997770,4cyclictest1591106-21kworker/u8:3+flush-179:020:05:010
1575261997661,11cyclictest266-21systemd-journal00:00:001
1575261997563,8cyclictest266-21systemd-journal21:00:001
1575256997568,5cyclictest1575148-21kworker/u8:0+flush-179:019:30:190
1575256997568,5cyclictest1575148-21kworker/u8:0+flush-179:019:30:190
1575266997466,6cyclictest1674690-21turbostat00:20:013
1575261997466,6cyclictest1629513-21latency_hist22:00:011
1575256997463,9cyclictest1588124-21apt-get19:50:120
1575256997366,5cyclictest1632961-21apt-get22:10:110
1575256997339,31cyclictest714-21Xorg21:54:590
1575261997163,6cyclictest1618383-21latency_hist21:25:001
1575256997165,4cyclictest1648858-21kworker/u8:3+flush-179:023:10:230
1575256997165,4cyclictest1599258-21kworker/u8:1+events_unbound20:45:130
1575256997164,5cyclictest1594220-21kworker/u8:2+flush-179:021:25:210
1575256997160,7cyclictest1620016-21kworker/u8:0+events_unbound21:40:150
1575256997063,5cyclictest1674672-21latency_hist00:20:000
1575256996961,5cyclictest1640902-21kworker/u8:2+flush-179:022:45:250
1575256996959,8cyclictest1674947-21apt-get00:20:110
1575261996862,4cyclictest1665324-21apt-get23:50:101
1575256996861,5cyclictest1629566-21kworker/u8:2+events_unbound22:05:140
1575261996758,7cyclictest1620016-21kworker/u8:0+flush-179:021:50:241
1575261996758,6cyclictest1677865-21latency_hist00:30:011
1575256996756,9cyclictest1594489-21apt-get20:10:110
1575261996658,6cyclictest1641160-21/usr/sbin/munin22:35:271
1575256996656,7cyclictest1620016-21kworker/u8:0+events_unbound21:55:180
1575256996557,6cyclictest1599258-21kworker/u8:1+flush-179:020:30:150
1575261996455,6cyclictest1599258-21kworker/u8:1+flush-179:020:45:201
1575256996457,5cyclictest1620016-21kworker/u8:0+flush-179:022:30:000
1575256996457,5cyclictest1599258-21kworker/u8:1+events_unbound20:45:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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