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2026-04-08 - 22:18
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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 Wed Apr 08, 2026 12:44:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
41247509910291,8cyclictest4140861-21latency_hist08:00:010
4124752999788,6cyclictest4169799-21latency_hist09:30:011
4124750999386,5cyclictest4190736-21latency_hist10:35:010
4124750999381,10cyclictest266-21systemd-journal12:00:000
4124752998981,5cyclictest6107-21kworker/u8:1+flush-179:011:15:221
4124752998563,19cyclictest4170056-21apt-get09:30:101
4124752998445,29cyclictest4152237-21latency_hist08:35:001
4124752998445,29cyclictest4152237-21latency_hist08:35:001
4124750998478,4cyclictest4145860-21kworker/u8:1+flush-179:008:35:210
4124750998374,6cyclictest4193929-21latency_hist10:45:010
4124752998173,6cyclictest4177782-21kworker/u8:3+flush-179:010:05:011
4124752998169,9cyclictest266-21systemd-journal11:35:001
4124752997766,7cyclictest4182819-21kworker/u8:1+flush-179:010:20:001
4124752997665,9cyclictest4183022-21/usr/sbin/munin10:10:231
4124752997566,7cyclictest266-21systemd-journal10:25:001
4124750997567,6cyclictest4127831-21latency_hist07:20:020
4124752997465,7cyclictest4174579-21latency_hist09:45:011
4124752997263,6cyclictest4189149-21latency_hist10:30:021
4124750997061,6cyclictest19633-21latency_hist11:45:010
4124750996963,5cyclictest4158633-21kworker/u8:0+flush-179:010:00:190
4124752996858,8cyclictest4157305-21/usr/sbin/munin08:50:221
4124752996757,8cyclictest4158891-21/usr/sbin/munin08:55:221
4124750996762,3cyclictest4144541-21apt-get08:10:110
4124750996761,4cyclictest4158633-21kworker/u8:0+events_unbound09:45:250
4124750996761,4cyclictest4145860-21kworker/u8:1+flush-179:009:00:220
4124750996760,5cyclictest4131059-21kworker/u8:3+flush-179:007:40:010
4124752996659,5cyclictest8483-21apt-get11:10:101
4124752996659,4cyclictest4133389-21kworker/u8:0+events_unbound07:45:241
4124752996657,6cyclictest3198-21apt-get10:55:011
4124750996662,3cyclictest26045-21kworker/u8:1+flush-179:012:20:020
4124750996656,7cyclictest4137947-21diskstats07:50:140
4124750996458,4cyclictest4163479-21kworker/u8:3+flush-179:009:25:010
4124757996359,2cyclictest0-21swapper/311:14:593
4124752996351,10cyclictest23059-21apt-get11:55:111
4124750996358,3cyclictest4131059-21kworker/u8:3+flush-179:007:40:180
4124750996358,3cyclictest4131059-21kworker/u8:3+flush-179:007:40:180
4124750996357,4cyclictest4177782-21kworker/u8:3+flush-179:010:10:200
4124750996357,4cyclictest27838-21apt-get12:10:100
4124752996150,8cyclictest266-21systemd-journal09:05:001
4124752996050,7cyclictest15093-21kworker/u8:0+flush-179:011:35:221
4124750996053,5cyclictest4182819-21kworker/u8:1+events_unbound10:35:250
4124750995954,3cyclictest6107-21kworker/u8:1+flush-179:011:15:200
4124750995953,5cyclictest4158633-21kworker/u8:0+flush-179:009:25:160
4124750995952,5cyclictest4131269-21apt-get07:30:110
4124752995849,7cyclictest4123158-21kworker/u8:0+flush-179:007:20:001
4124752995848,8cyclictest4147719-21/usr/sbin/munin08:20:221
4124750995851,5cyclictest4149322-21apt-get08:25:120
4124750995851,5cyclictest4133389-21kworker/u8:0+flush-179:007:45:210
4124750995850,6cyclictest4171623-21/usr/sbin/munin09:35:240
4124750995850,6cyclictest13505-21kworker/u8:2+flush-179:011:50:200
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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