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2026-04-21 - 19:15
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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 50 highest latencies:
System rackeslot6.osadl.org (updated Tue Apr 21, 2026 12:44:57)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
235499299112103,7cyclictest2382541-21latency_hist08:35:011
23549929910899,6cyclictest2413038-21latency_hist10:10:011
23549929910394,7cyclictest2457904-21latency_hist12:30:011
23549909910090,7cyclictest2393681-21latency_hist09:10:010
2354990998878,7cyclictest2366646-21latency_hist07:45:010
2354992998476,6cyclictest2388902-21latency_hist08:55:011
2354990998475,7cyclictest2395267-21latency_hist09:15:010
2354990998475,7cyclictest1213033-21systemd-journal08:40:010
2354990998273,7cyclictest2377771-21latency_hist08:20:010
2354992998174,5cyclictest2445175-21latency_hist11:50:001
2354992998172,7cyclictest2435079-21kworker/u8:2+flush-179:012:15:011
2354990997971,5cyclictest2361543-21kworker/u8:1+flush-179:007:35:000
2354997997559,5cyclictest2392110-21turbostat09:05:003
2354997997559,5cyclictest2392110-21turbostat09:05:003
2354992997464,7cyclictest1213033-21systemd-journal08:04:061
2354992997455,17cyclictest2435079-21kworker/u8:2+flush-179:012:05:051
2354992997455,17cyclictest2435079-21kworker/u8:2+flush-179:012:05:051
2354990997466,5cyclictest2448630-21kworker/u8:0+flush-179:012:05:220
2354990997466,5cyclictest2448630-21kworker/u8:0+flush-179:012:05:210
2354992997364,7cyclictest2397117-21/usr/sbin/munin09:20:231
2354990997162,7cyclictest2359920-21latency_hist07:25:000
2354990997162,7cyclictest2359920-21latency_hist07:25:000
2354990997063,5cyclictest2396921-21kworker/u8:2+flush-179:009:34:560
2354990997063,5cyclictest2377743-21kworker/u8:3+flush-179:008:25:250
2354992996961,6cyclictest2368220-21latency_hist07:50:001
2354992996961,6cyclictest2368220-21latency_hist07:50:001
2354990996858,7cyclictest2379367-21latency_hist08:25:010
2354990996757,8cyclictest1213033-21systemd-journal11:20:000
2354990996660,4cyclictest2393716-21kworker/u8:4+flush-179:010:15:010
2354990996655,9cyclictest2373259-21apt-get08:05:110
2354992996559,4cyclictest2406666-21kworker/u8:1+flush-179:010:16:581
2354992996559,4cyclictest2406666-21kworker/u8:1+flush-179:010:16:571
2354992996556,7cyclictest2388937-21kworker/u8:3+flush-179:009:00:001
2354997996462,1cyclictest0-21swapper/308:05:593
2354990996356,5cyclictest2368255-21kworker/u8:2+flush-179:007:55:160
2354992996254,6cyclictest2422646-21latency_hist10:40:021
2354992996254,6cyclictest2361543-21kworker/u8:1+flush-179:007:40:001
2354992996253,7cyclictest2393716-21kworker/u8:4+events_unbound09:30:001
2354992996154,5cyclictest2385989-21apt-get08:45:101
2354992996051,6cyclictest2419444-21kworker/u8:2+flush-179:011:00:001
2354992996050,8cyclictest2405631-21diskstats09:45:151
2354992996050,7cyclictest1213033-21systemd-journal09:19:051
2354990995953,4cyclictest2338441-21kworker/u8:0+flush-179:007:20:000
2354997995851,5cyclictest2416301-21turbostat10:20:013
2354997995851,5cyclictest2416301-21turbostat10:20:003
2354992995855,2cyclictest0-21swapper/107:33:001
2354990995852,4cyclictest2384182-21kworker/u8:0+flush-179:008:45:010
2354990995848,7cyclictest2393716-21kworker/u8:4+flush-179:010:00:210
2354990995847,9cyclictest2429533-21apt-get11:00:110
2354990995652,3cyclictest2440392-21kworker/u8:3+flush-179:012:00:260
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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