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2026-05-21 - 00:23
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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 May 20, 2026 12:44:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
295485199118107,8cyclictest3061101-21latency_hist12:40:021
295484899118106,9cyclictest2994801-21latency_hist09:15:010
295484899114102,9cyclictest2954742-21kworker/u8:2+flush-179:007:15:010
295484899109102,5cyclictest3040435-21kworker/u8:3+flush-179:012:05:000
29548489910899,6cyclictest1213033-21systemd-journal08:35:010
29548519910496,5cyclictest3041992-21latency_hist11:40:011
29548519910293,7cyclictest2986848-21latency_hist08:50:011
29548519910190,8cyclictest2997996-21latency_hist09:25:021
29548519910184,11cyclictest1213033-21systemd-journal09:40:001
29548519910092,5cyclictest3008722-21kworker/u8:3+flush-179:010:45:231
2954851999282,7cyclictest3019206-21apt-get10:30:001
2954851999178,10cyclictest1213033-21systemd-journal09:10:011
2954848999184,4cyclictest2961135-21kworker/u8:3+flush-179:008:05:160
2954848999175,13cyclictest3003082-21true09:40:010
2954851998982,4cyclictest3047786-21kworker/u8:0+flush-179:011:55:241
2954848998579,4cyclictest3028660-21kworker/u8:1+flush-179:011:30:010
2954851998476,6cyclictest3054695-21kworker/u8:2+flush-179:012:20:011
2954851998476,6cyclictest3007091-21kworker/u8:0+flush-179:010:00:001
2954848998478,5cyclictest3001409-21kworker/u8:1+flush-179:009:40:250
2954851998377,4cyclictest2993452-21kworker/u8:0+flush-179:009:15:141
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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