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2026-04-20 - 15:37
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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 Mon Apr 20, 2026 12:44:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
37463409910596,7cyclictest3754285-21latency_hist07:35:010
37463409910292,8cyclictest3792778-21latency_hist09:35:000
3746341999686,7cyclictest3821965-21latency_hist11:05:011
3746341999284,6cyclictest3845066-21latency_hist12:15:011
3746340999081,6cyclictest3806030-21latency_hist10:15:010
3746340998677,6cyclictest3765458-21latency_hist08:10:010
3746341998577,6cyclictest3812403-21latency_hist10:35:011
3746340998174,5cyclictest3732450-21kworker/u8:0+events_unbound07:20:010
3746340997969,7cyclictest3747914-21latency_hist07:15:010
3746341997668,6cyclictest3784819-21latency_hist09:10:011
3746341997568,4cyclictest3821974-21apt-get11:05:031
3746341997566,7cyclictest3797542-21kworker/u8:1+flush-179:009:50:001
3746341997467,5cyclictest3831752-21kworker/u8:3+flush-179:011:40:001
3746340997467,5cyclictest3804444-21latency_hist10:10:010
3746341997264,6cyclictest3828590-21latency_hist11:25:011
3746341997160,9cyclictest1213033-21systemd-journal11:30:011
3746340997160,9cyclictest3775324-21kworker/u8:2+flush-179:009:00:000
3746340997062,5cyclictest3846666-21latency_hist12:20:010
3746341996947,19cyclictest1213033-21systemd-journal10:00:011
3746340996759,5cyclictest3786404-21latency_hist09:15:010
3746340996659,5cyclictest3783490-21apt-get09:05:120
3746340996656,8cyclictest1213033-21systemd-journal12:25:010
374634499650,62cyclictest0-21swapper/207:58:002
3746340996558,5cyclictest3795973-21latency_hist09:45:010
374634699630,55cyclictest0-21swapper/307:58:003
3746341996236,22cyclictest3826983-21sh11:20:001
3746341995952,5cyclictest3810815-21latency_hist10:30:011
3746341995852,4cyclictest3746042-21latency_hist07:10:031
3746341995649,6cyclictest3759756-21kworker/u8:0+flush-179:007:55:001
3746341995638,17cyclictest3814056-21kworker/u8:1+events_unbound11:15:001
3746340995648,6cyclictest3788055-21kworker/u8:0+flush-179:009:25:250
3746340995547,6cyclictest3780036-21latency_hist08:55:010
3746341995447,5cyclictest3797816-21apt-get09:50:121
3746341995447,5cyclictest3741309-21kworker/u8:3+flush-179:007:25:001
3746341995444,8cyclictest3812661-21apt-get10:35:131
3746344995349,2cyclictest0-21swapper/210:11:592
3746346995248,2cyclictest0-21swapper/310:11:583
3746341995245,5cyclictest3760709-21kworker/u8:3+flush-179:008:00:001
3746340995243,7cyclictest1213033-21systemd-journal08:45:000
3746340995243,7cyclictest1213033-21systemd-journal08:44:590
3746340995148,2cyclictest0-21swapper/007:22:590
3746340995140,9cyclictest1213033-21systemd-journal10:35:000
3746341995044,5cyclictest3814056-21kworker/u8:1+flush-179:010:55:241
3746341995040,8cyclictest3838629-21/usr/sbin/munin11:55:171
3746341994944,4cyclictest3848299-21kworker/u8:2+flush-179:012:35:251
374634199490,6cyclictest3768911-21grep08:20:011
374634199490,6cyclictest3768911-21grep08:20:011
3746340994939,8cyclictest3754523-21/usr/sbin/munin07:35:240
3746340994841,6cyclictest3834961-21latency_hist11:45:010
3746340994840,6cyclictest1213033-21systemd-journal12:29:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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