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2026-04-17 - 11:11
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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 Fri Apr 17, 2026 00:44:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2396101999989,7cyclictest2478434-21latency_hist23:25:000
2396101999284,6cyclictest2473650-21latency_hist23:10:010
2396101998775,10cyclictest1213033-21systemd-journal21:50:000
2396104998172,7cyclictest2457733-21latency_hist22:20:011
2396104998073,5cyclictest2420080-21latency_hist20:25:011
2396101997767,7cyclictest2399341-21kworker/u8:1+flush-179:019:35:000
2396104997669,5cyclictest2468867-21latency_hist22:55:011
2396101997361,9cyclictest2449510-21apt-get21:55:000
2396101996959,7cyclictest2395900-21latency_hist19:10:030
2396101996959,7cyclictest2395900-21latency_hist19:10:030
2396104996860,5cyclictest2459328-21latency_hist22:25:011
2396104996857,8cyclictest1213033-21systemd-journal00:40:001
2396101996861,5cyclictest2496264-21latency_hist00:20:020
2396101996757,6cyclictest1-21systemd00:40:000
2396104996559,5cyclictest2486387-21latency_hist23:50:001
2396101996449,11cyclictest2489891-21kworker/u8:2+flush-179:000:00:110
2396101996449,11cyclictest2489891-21kworker/u8:2+flush-179:000:00:110
2396104996255,5cyclictest2472066-21latency_hist23:05:011
2396104996155,4cyclictest2404143-21kworker/u8:3+flush-179:020:50:011
2396104996153,7cyclictest2428568-21apt-get20:50:001
2396101996129,30cyclictest0-21swapper/022:13:580
2396101996055,4cyclictest2449318-21kworker/u8:2+flush-179:022:00:210
2396101995951,6cyclictest2483219-21latency_hist23:40:010
2396104995848,8cyclictest2420335-21apt-get20:25:101
2396105995552,2cyclictest0-21swapper/220:26:582
2396104995548,5cyclictest2489891-21kworker/u8:2+flush-179:000:00:121
2396104995548,5cyclictest2489891-21kworker/u8:2+flush-179:000:00:111
2396104995546,7cyclictest1213033-21systemd-journal21:25:001
2396101995549,4cyclictest2399341-21kworker/u8:1+events_unbound19:20:010
2396101995548,5cyclictest2432245-21/usr/sbin/munin21:00:210
2396104995445,7cyclictest2407597-21apt-get19:45:131
2396101995443,9cyclictest2423770-21apt-get20:35:120
2396107995351,1cyclictest0-21swapper/320:26:593
2396105995350,2cyclictest0-21swapper/219:14:592
2396105995350,2cyclictest0-21swapper/219:14:582
2396104995340,11cyclictest2435224-21kworker/u8:1+flush-179:021:15:011
2396107995249,2cyclictest0-21swapper/319:14:583
2396107995249,2cyclictest0-21swapper/319:14:583
2396104995244,6cyclictest2484802-21latency_hist23:45:021
2396101995244,6cyclictest2425665-21diskstats20:40:150
2396104995145,3cyclictest2470471-21ls22:59:591
2396104995144,5cyclictest2392946-21kworker/u8:0+flush-179:019:25:001
2396104995139,8cyclictest0-21swapper/119:35:121
2396104995044,5cyclictest1213033-21systemd-journal00:26:221
2396104995044,5cyclictest1213033-21systemd-journal00:26:221
2396101995046,2cyclictest2470461-21munin-run23:00:000
2396101995041,7cyclictest2476844-21latency_hist23:20:010
2396104994942,5cyclictest2412115-21latency_hist20:00:001
239610199494,37cyclictest2412104-21turbostat20:04:540
2396101994941,6cyclictest2435224-21kworker/u8:1+flush-179:021:20:170
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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