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2026-08-05 - 02:14
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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 Tue Aug 04, 2026 12:44:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
408032399130119,7cyclictest4177407-21latency_hist12:10:011
408032399126116,7cyclictest4137340-21latency_hist10:05:011
408032099126118,6cyclictest4125965-21kworker/u8:3+events_unbound09:45:010
408032399125108,15cyclictest4094828-21kworker/u8:2+flush-179:008:00:001
408032099124118,4cyclictest4138359-21kworker/u8:1+flush-179:010:15:180
408032099124111,10cyclictest4150339-21latency_hist10:45:010
408032099123115,6cyclictest4125965-21kworker/u8:3+events_unbound09:40:010
408032399117110,5cyclictest4096447-21apt-get08:00:021
408032099117111,4cyclictest4143224-21kworker/u8:0+events_unbound10:50:000
408032099116108,5cyclictest4096530-21kworker/u8:3+events_unbound08:25:010
408032099115107,6cyclictest4086584-21kworker/u8:0+flush-179:007:30:240
408032399114104,7cyclictest4124343-21latency_hist09:25:011
408032399114102,10cyclictest4114702-21/usr/sbin/munin08:55:241
408032099114105,7cyclictest4117125-21kworker/u8:2+flush-179:009:15:020
408032099114105,6cyclictest4109744-21kworker/u8:0+events_unbound09:35:000
4080320991121,108cyclictest1-21systemd08:40:000
40803239910997,9cyclictest4175821-21latency_hist12:05:001
408032099109102,5cyclictest4084977-21kworker/u8:3+events_unbound07:25:250
408032099109101,6cyclictest4109744-21kworker/u8:0+events_unbound09:24:590
40803209910797,6cyclictest4171031-21kworker/u8:3+flush-179:012:00:210
40803209910790,13cyclictest1213033-21systemd-journal10:15:000
408032099107100,5cyclictest4147124-21kworker/u8:3+flush-179:010:55:230
40803209910695,8cyclictest4095093-21apt-get07:55:130
40803209910598,4cyclictest4143224-21kworker/u8:0+flush-179:011:00:210
40803209910597,6cyclictest4075719-21kworker/u8:0+flush-179:007:15:010
40803209910595,7cyclictest4075719-21kworker/u8:0+flush-179:007:20:000
40803209910495,7cyclictest4143224-21kworker/u8:0+events_unbound10:30:010
40803209910386,6cyclictest4143224-21kworker/u8:0+events_unbound10:35:010
40803209910386,6cyclictest4143224-21kworker/u8:0+events_unbound10:35:010
40803209910296,4cyclictest4125965-21kworker/u8:3+events_unbound10:05:230
40803209910192,6cyclictest4171023-21kworker/u8:0+flush-179:012:10:020
40803239910090,7cyclictest4114463-21latency_hist08:55:021
40803239910090,7cyclictest4114463-21latency_hist08:55:011
40803239910086,12cyclictest4130721-21apt-get09:45:001
4080323999888,6cyclictest4094828-21kworker/u8:2+flush-179:007:55:011
4080323999789,6cyclictest4108353-21apt-get08:35:121
4080320999791,4cyclictest4086584-21kworker/u8:0+flush-179:007:50:160
4080320999788,6cyclictest4171031-21kworker/u8:3+events_unbound12:15:150
4080320999788,5cyclictest4109744-21kworker/u8:0+events_unbound08:50:020
4080320999786,9cyclictest4119248-21apt-get09:06:000
4080320999784,9cyclictest1213033-21systemd-journal08:15:010
4080320999686,6cyclictest4096530-21kworker/u8:3+flush-179:008:30:270
4080320999684,9cyclictest4117125-21kworker/u8:2+events_unbound09:05:000
4080323999483,8cyclictest4180846-21latency_hist12:20:011
4080320999488,4cyclictest4109744-21kworker/u8:0+events_unbound09:55:260
4080320999385,5cyclictest4171023-21kworker/u8:0+events_unbound11:55:150
4080320999383,6cyclictest4125965-21kworker/u8:3+flush-179:009:45:210
4080320999381,8cyclictest4084977-21kworker/u8:3+flush-179:007:35:160
4080323999285,5cyclictest4075719-21kworker/u8:0+flush-179:007:15:251
4080323999284,5cyclictest4161458-21kworker/u8:0+flush-179:011:35:181
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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