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2026-05-12 - 16:30
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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 rackfslot7.osadl.org (updated Tue May 12, 2026 12:46:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
4183555991141,112cyclictest0-21swapper/212:05:132
418355999860,84cyclictest0-21swapper/612:05:136
4183557997618,39cyclictest142849-21ntpq11:45:214
418355799760,60cyclictest0-21swapper/409:04:594
4183557997436,38cyclictest362-21jbd2/sda2-812:36:434
4183557997416,39cyclictest362-21jbd2/sda2-810:28:434
4183557997234,19cyclictest1-21systemd09:50:014
4183557997214,39cyclictest54433-21kworker/u32:1+events_unbound09:11:514
4183557997214,39cyclictest4149123-21kworker/u32:3+events_unbound07:39:274
4183557997133,38cyclictest0-21swapper/411:54:574
4183557997133,38cyclictest0-21swapper/409:41:254
4183557997132,20cyclictest0-21swapper/407:43:494
4183557997112,39cyclictest236199-21snmpd10:16:574
4183557997069,1cyclictest14909-21apt-get07:55:114
4183557997032,38cyclictest0-21swapper/409:35:454
4183557997012,39cyclictest4191290-21/usr/sbin/munin07:20:254
4183557996929,39cyclictest161270-21cstates12:20:134
418355799678,59cyclictest167870-21ntpq12:30:194
4183557996628,19cyclictest0-21swapper/407:30:034
4183557996445,19cyclictest601ktimers/411:14:114
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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