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2026-05-18 - 23:04
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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 Mon May 18, 2026 12:44:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
16377899910494,7cyclictest1725568-21latency_hist11:40:010
16377929910291,7cyclictest1744905-21kworker/u8:2+flush-179:012:40:001
16377899910190,8cyclictest1700909-21latency_hist10:25:010
16377899910090,7cyclictest1715749-21latency_hist11:10:000
1637792999588,5cyclictest1688409-21kworker/u8:0+events_unbound10:05:011
1637792999586,6cyclictest1641928-21kworker/u8:1+flush-179:007:45:001
1637792999282,7cyclictest1668218-21kworker/u8:2+flush-179:009:00:241
1637792999276,5cyclictest1707776-21kworker/u8:0+flush-179:011:05:251
1637792999180,8cyclictest1683934-21diskstats09:30:151
1637792999078,8cyclictest1213033-21systemd-journal10:19:551
1637792998980,7cyclictest1653916-21apt-get08:00:011
1637792998980,6cyclictest1649107-21kworker/u8:2+flush-179:007:45:201
1637792998580,3cyclictest1712618-21kworker/u8:1+flush-179:012:35:001
1637792998580,3cyclictest1712618-21kworker/u8:1+flush-179:012:34:591
1637792998580,3cyclictest1682429-21kworker/u8:3+flush-179:010:30:161
1637792998577,6cyclictest1741742-21latency_hist12:30:021
1637789998572,10cyclictest1641928-21kworker/u8:1+flush-179:008:30:220
1637792998475,7cyclictest1671665-21latency_hist08:55:011
1637792998376,4cyclictest1707776-21kworker/u8:0+events_unbound11:15:191
1637792998273,6cyclictest1715784-21kworker/u8:2+flush-179:011:20:151
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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