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2026-04-16 - 11:31
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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 Thu Apr 16, 2026 00:44:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
379415099115103,10cyclictest3887502-40logrotate00:00:010
3794150999183,5cyclictest3840806-21latency_hist21:35:000
3794150998778,7cyclictest3894199-21latency_hist00:20:010
3794150998476,6cyclictest3892589-21latency_hist00:15:010
3794152998376,5cyclictest3890756-21apt-get00:10:031
3794150998276,4cyclictest3881189-21kworker/u8:3+events_unbound00:30:000
3794150998276,4cyclictest3857252-21kworker/u8:1+events_unbound00:04:000
3794150998168,11cyclictest266-21systemd-journal23:00:000
3794150997968,9cyclictest3805478-21latency_hist19:45:010
3794152997768,7cyclictest266-21systemd-journal22:00:001
3794152997569,5cyclictest3857252-21kworker/u8:1+flush-179:000:35:001
3794150997468,4cyclictest3791088-21kworker/u8:1+events_unbound19:10:240
3794152997362,8cyclictest266-21systemd-journal19:40:131
3794150997365,6cyclictest3850627-21latency_hist22:05:010
3794150997264,6cyclictest3882732-21latency_hist23:45:000
3794150997264,6cyclictest3882732-21latency_hist23:45:000
3794152997164,5cyclictest3834418-21kworker/u8:0+flush-179:021:35:211
3794150997164,5cyclictest3850662-21kworker/u8:3+flush-179:022:15:220
3794152997061,6cyclictest3826427-21latency_hist20:50:011
3794152996963,4cyclictest3881189-21kworker/u8:3+events_unbound00:00:221
3794152996961,6cyclictest3842459-21kworker/u8:1+flush-179:021:50:001
3794150996964,4cyclictest3878184-21kworker/u8:0+events_unbound23:40:010
3794150996962,5cyclictest3834418-21kworker/u8:0+events_unbound21:25:010
3794150996962,5cyclictest3797928-21kworker/u8:0+flush-179:019:20:210
4577091680,18ptp4l441ktimers/319:05:493
3794152996863,4cyclictest3881189-21kworker/u8:3+flush-179:000:05:221
3794152996762,4cyclictest3818452-21kworker/u8:1+flush-179:020:29:561
3794152996760,5cyclictest3849705-21kworker/u8:2+flush-179:022:10:011
3794152996760,5cyclictest3849705-21kworker/u8:2+flush-179:022:10:001
3794152996756,9cyclictest3872911-21apt-get23:15:001
3794152996756,9cyclictest3872911-21apt-get23:15:001
3794152996660,5cyclictest3791092-21kworker/u8:2+flush-179:019:29:591
3794152996559,4cyclictest3857252-21kworker/u8:1+flush-179:022:45:151
3794150996560,4cyclictest3811571-21kworker/u8:0+flush-179:020:55:250
3794150996558,6cyclictest3868094-21kworker/u8:0+flush-179:023:10:000
3794150996556,7cyclictest266-21systemd-journal22:15:010
3794152996459,4cyclictest3857252-21kworker/u8:1+flush-179:000:39:541
3794152996459,4cyclictest3817124-21/usr/sbin/munin20:20:231
3794150996453,9cyclictest3890756-21apt-get00:10:000
3794152996357,5cyclictest3834418-21kworker/u8:0+flush-179:021:50:201
3794152996357,4cyclictest3881189-21kworker/u8:3+flush-179:023:55:151
3794152996256,5cyclictest3811571-21kworker/u8:0+events_unbound21:00:251
3794152996256,4cyclictest3861823-21kworker/u8:2+events_unbound22:40:141
3794150996255,6cyclictest3857252-21kworker/u8:1+events_unbound23:20:010
3794150996255,5cyclictest3818452-21kworker/u8:1+flush-179:020:25:220
3794152996155,4cyclictest3849705-21kworker/u8:2+flush-179:022:00:211
3794152996155,4cyclictest3829710-21kworker/u8:3+events_unbound21:10:131
3794152996155,4cyclictest3811571-21kworker/u8:0+flush-179:020:54:551
3794150996155,4cyclictest3874819-21kworker/u8:3+flush-179:023:20:150
3794150996155,4cyclictest3857252-21kworker/u8:1+flush-179:023:10:210
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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