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2026-05-08 - 16:03
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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 08, 2026 12:44:57)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3288736999690,4cyclictest3376565-21kworker/u8:1+events_unbound12:14:591
3288736999690,4cyclictest3376565-21kworker/u8:1+events_unbound12:14:591
3288734999684,9cyclictest3322702-21kworker/u8:1+flush-179:009:00:010
3288734999684,9cyclictest3322702-21kworker/u8:1+flush-179:009:00:010
3288734999469,6cyclictest3337322-21latency_hist09:40:010
3288736999179,9cyclictest3306472-21kworker/u8:1+flush-179:008:05:001
3288736998646,28cyclictest3391961-21diskstats12:25:141
3288734998677,7cyclictest3376572-21latency_hist11:40:020
3288736998169,9cyclictest3371288-21apt-get11:25:021
3288736998066,12cyclictest3378141-21kworker/u8:4+flush-179:012:00:001
3288736998059,18cyclictest3363983-21kworker/u8:0+flush-179:011:20:001
3288734997973,5cyclictest3314762-21kworker/u8:3+flush-179:008:35:000
3288734997972,5cyclictest3383217-21kworker/u8:2+flush-179:012:15:150
3288734997869,6cyclictest3386378-21latency_hist12:10:010
3288734997867,9cyclictest3365160-21apt-get11:05:100
3288734997768,6cyclictest3353756-21latency_hist10:30:020
3288734997668,5cyclictest3383217-21kworker/u8:2+flush-179:012:00:140
3288734997565,7cyclictest3371272-21latency_hist11:25:020
3288736997466,6cyclictest3322702-21kworker/u8:1+flush-179:010:25:231
3288736997365,6cyclictest3396203-21latency_hist12:40:021
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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