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2025-11-15 - 14:03
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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 20 highest latencies:
System rackeslot6.osadl.org (updated Sat Nov 15, 2025 00:44:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
15450469910477,24cyclictest1593237-21latency_hist21:40:010
1545049998979,8cyclictest1556122-21apt-get19:45:031
1545046998973,12cyclictest1638876-40mandb00:00:020
1545049998780,4cyclictest1583428-21latency_hist21:10:001
1545049998479,4cyclictest1552898-21kworker/u8:2+events_unbound20:40:011
1545046998372,7cyclictest1650325-21latency_hist00:35:010
1545049998269,4cyclictest1591638-21kworker/u8:2+flush-179:021:50:011
1545049998176,3cyclictest1575523-21kworker/u8:1+events_unbound20:45:281
1545049998164,4cyclictest1606231-21kworker/u8:2+events_unbound22:25:011
1545049997972,5cyclictest1532780-21kworker/u8:0+events_unbound19:15:231
1545046997972,5cyclictest1589010-21kworker/u8:0+events_unbound21:30:010
1545049997771,4cyclictest1645272-21kworker/u8:2+flush-179:000:20:001
1545049997467,5cyclictest1601246-21kworker/u8:2+flush-179:022:09:591
1545049997465,7cyclictest1561386-21kworker/u8:1+events_unbound20:10:191
1545046997463,9cyclictest1642362-21apt-get00:10:130
1545049997362,10cyclictest1617619-21kworker/u8:0+flush-179:023:35:011
1545049997360,10cyclictest1617124-21latency_hist22:55:021
1545049997267,4cyclictest1639131-21kworker/u8:2+events_unbound00:04:001
1545049997265,5cyclictest1604372-21kworker/u8:1+events_unbound22:20:011
1545049997264,6cyclictest1609202-21kworker/u8:3+flush-179:022:40:291
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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