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2026-01-10 - 22:33
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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 Jan 10, 2026 12:44:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
21486869910697,7cyclictest2174440-21kworker/u8:0+events_unbound08:45:000
21486899910497,5cyclictest2184023-21apt-get09:00:021
2148686999283,6cyclictest2237497-21kworker/u8:0+events_unbound11:45:020
2148686999182,7cyclictest2182441-21kworker/u8:4+events_unbound09:15:030
2148686999083,5cyclictest2198899-21kworker/u8:2+events_unbound10:24:590
2148686999079,8cyclictest2177636-21latency_hist08:40:020
2148686998980,7cyclictest2142624-21kworker/u8:0+events_unbound07:55:190
2148686998882,4cyclictest2165705-21kworker/u8:2+events_unbound08:00:250
2148686998880,6cyclictest2226444-21kworker/u8:2+events_unbound11:30:010
2148686998880,5cyclictest2226444-21kworker/u8:2+events_unbound11:35:150
2148689998777,7cyclictest2156666-21latency_hist07:35:011
2148689998676,7cyclictest2176044-21latency_hist08:35:011
2148686998577,6cyclictest2192721-21kworker/u8:0+events_unbound09:45:020
2148686998576,6cyclictest2194068-21latency_hist09:30:010
2148689998272,7cyclictest2213659-21/usr/sbin/munin10:30:241
2148689998173,6cyclictest2161467-21latency_hist07:50:001
2148686998174,6cyclictest2156699-21kworker/u8:1+events_unbound07:50:230
2148686998073,5cyclictest2186097-21/usr/sbin/munin09:05:240
2148686997871,4cyclictest2142624-21kworker/u8:0+events_unbound07:30:150
2148686997862,5cyclictest2192721-21kworker/u8:0+events_unbound10:40:230
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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