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2025-11-21 - 23:21
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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 Nov 21, 2025 12:44:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
31327949910190,8cyclictest3137475-21latency_hist07:25:010
3132798999787,7cyclictest3149205-21latency_hist08:00:011
3132798999591,3cyclictest3132719-21kworker/u8:3+events_unbound07:15:241
3132798999281,8cyclictest271-21systemd-journal09:00:001
3132798999082,3cyclictest3158805-21kworker/u8:3+events_unbound08:45:251
3132794998876,9cyclictest3161946-21latency_hist08:40:020
3132798998777,7cyclictest3187664-21latency_hist10:00:011
3132798998776,8cyclictest3218143-21latency_hist11:35:011
3132794998574,8cyclictest3176263-21latency_hist09:25:000
3132798998479,4cyclictest3207253-21kworker/u8:0+events_unbound11:50:251
3132794998374,7cyclictest3195618-21latency_hist10:25:010
3132798998272,4cyclictest3199083-21kworker/u8:2+events_unbound11:00:331
3132794998274,6cyclictest3227313-21kworker/u8:1+flush-179:012:05:260
3132798998070,4cyclictest3132719-21kworker/u8:3+events_unbound07:30:221
3132794997969,7cyclictest3211775-21latency_hist11:15:010
3132798997873,4cyclictest3168549-21kworker/u8:2+events_unbound09:05:291
3132798997570,4cyclictest3157154-21kworker/u8:0+events_unbound08:25:241
3132798997469,4cyclictest3161970-21kworker/u8:0+events_unbound08:40:241
3132798997465,3cyclictest3154011-21kworker/u8:1+events_unbound08:20:201
3132798997363,7cyclictest3173070-21latency_hist09:15:011
3132798997064,4cyclictest3204881-21kworker/u8:1+events_unbound10:55:161
3132798997061,7cyclictest3168549-21kworker/u8:2+flush-179:009:20:001
3132798997061,3cyclictest3213343-21kworker/u8:1+events_unbound11:20:251
3132798997059,8cyclictest3197459-21latency_hist10:30:001
3132798997059,8cyclictest3197459-21latency_hist10:30:001
3132798996960,4cyclictest3147851-21kworker/u8:2+events_unbound08:05:181
3132798996859,7cyclictest3189252-21latency_hist10:05:011
3132798996857,9cyclictest3227952-21apt-get12:05:141
313280099670,65cyclictest0-21swapper/209:19:592
3132798996763,3cyclictest3132645-21kworker/u8:2+flush-179:007:20:241
3132798996662,3cyclictest3229263-21kworker/u8:0+flush-179:012:19:561
3132798996661,4cyclictest3208597-21kworker/u8:3+flush-179:011:14:551
3132798996661,4cyclictest3144178-21kworker/u8:0+flush-179:007:45:231
3132798996554,8cyclictest3150809-21latency_hist08:05:001
3132798996455,4cyclictest3188397-21kworker/u8:2+events_unbound10:10:131
3132794996458,4cyclictest3171518-21kworker/u8:0+flush-179:009:20:000
3132798996359,3cyclictest3207253-21kworker/u8:0+flush-179:011:05:191
3132798996354,6cyclictest3158805-21kworker/u8:3+flush-179:008:40:011
3132798996258,3cyclictest3144178-21kworker/u8:0+flush-179:007:50:221
3132798996257,4cyclictest3168549-21kworker/u8:2+flush-179:009:25:261
3132798996256,4cyclictest3147851-21kworker/u8:2+flush-179:008:15:281
3132794996254,5cyclictest3158805-21kworker/u8:3+flush-179:009:10:150
3132794996229,23cyclictest3202240-21latency_hist10:45:020
3132798996156,4cyclictest3158805-21kworker/u8:3+flush-179:008:30:271
3132798996156,4cyclictest3135912-21kworker/u8:1+flush-179:007:40:291
3132798996156,4cyclictest3135912-21kworker/u8:1+flush-179:007:40:291
3132798996155,4cyclictest3199083-21kworker/u8:2+flush-179:010:55:001
3132798996056,3cyclictest3188397-21kworker/u8:2+flush-179:010:19:551
3132798996056,3cyclictest3147851-21kworker/u8:2+events_unbound08:10:251
3132798996055,4cyclictest3227313-21kworker/u8:1+flush-179:012:04:551
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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