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2026-05-15 - 19:58
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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 Fri May 15, 2026 12:44:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
17378939910896,9cyclictest1213033-21systemd-journal11:40:001
1737891999383,8cyclictest1765390-21apt-get08:32:530
1737891999180,9cyclictest1839506-21kworker/u8:2+flush-179:012:35:000
1737893999078,9cyclictest1757170-21latency_hist08:10:011
1737891998781,5cyclictest1776579-21kworker/u8:2+flush-179:009:40:240
1737895998556,27cyclictest0-21swapper/207:17:592
1737891998170,8cyclictest1799649-21/usr/sbin/munin10:20:230
1737891997970,7cyclictest1801034-21kworker/u8:2+flush-179:010:55:010
1737891997870,6cyclictest1768872-21kworker/u8:0+flush-179:008:55:190
1737893997769,6cyclictest1789823-21/usr/sbin/munin09:50:231
1737893997768,7cyclictest1820104-21latency_hist11:25:011
1737891997569,4cyclictest1742541-21kworker/u8:3+flush-179:007:50:150
1737891997568,5cyclictest1787987-21kworker/u8:3+flush-179:009:50:200
1737893997366,5cyclictest1742541-21kworker/u8:3+flush-179:008:15:241
1737891997368,4cyclictest1804159-21kworker/u8:0+events_unbound10:45:010
1737891997366,5cyclictest1768891-21apt-get08:45:120
1737891997363,8cyclictest1760594-21kworker/u8:2+flush-179:008:55:010
1737893997263,6cyclictest1734721-21kworker/u8:2+flush-179:007:35:161
1737893997056,13cyclictest1760594-21kworker/u8:2+flush-179:008:49:551
1737893996962,4cyclictest1742541-21kworker/u8:3+flush-179:008:00:201
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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