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2025-11-12 - 13:36
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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 Wed Nov 12, 2025 00:44:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
14955289910491,10cyclictest1525933-21latency_hist20:45:021
1495528998882,4cyclictest1585968-21kworker/u8:1+events_unbound00:15:001
1495528998778,6cyclictest271-21systemd-journal22:30:011
1495528998474,7cyclictest1539447-21latency_hist21:25:011
1495528998373,7cyclictest1581134-21kworker/u8:2+flush-179:000:00:001
1495526998271,8cyclictest1519563-21latency_hist20:25:010
1495526997969,7cyclictest1530958-21latency_hist21:00:000
1495526997867,8cyclictest1555356-21latency_hist22:15:010
1495528997466,5cyclictest1563939-21kworker/u8:0+flush-179:022:55:241
1495528997465,7cyclictest1513194-21latency_hist20:05:011
1495526997464,7cyclictest1519800-21/usr/sbin/munin20:25:240
1495526997459,11cyclictest1589131-40mandb00:00:010
1495526997362,8cyclictest1511589-21latency_hist20:00:010
1495528997263,6cyclictest1593968-21kworker/u8:0+events_unbound00:20:011
1495528997162,7cyclictest1541033-21latency_hist21:30:011
1495526997162,6cyclictest1556953-21latency_hist22:20:020
1495526996960,6cyclictest1532558-21latency_hist21:05:020
1495526996656,7cyclictest1565470-21/usr/sbin/munin22:45:250
1495526996555,7cyclictest1561965-21/usr/sbin/munin22:35:280
1495528996253,7cyclictest1516603-21/usr/sbin/munin20:15:241
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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