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2026-07-15 - 14:30
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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 Jul 15, 2026 00:44:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
284233999154146,6cyclictest2916890-21kworker/u8:0+events_unbound23:35:000
284233999154133,18cyclictest2872734-21latency_hist20:45:000
284233999135128,4cyclictest2929524-21kworker/u8:3+events_unbound00:00:000
284233999134128,4cyclictest2864746-21kworker/u8:2+flush-179:021:10:000
284233999134123,8cyclictest2877549-21kworker/u8:0+events_unbound21:30:010
284234199132117,13cyclictest2935891-21kworker/u8:1+flush-179:000:30:011
284234199126114,8cyclictest2913035-21latency_hist22:50:011
284233999125117,6cyclictest2890539-21kworker/u8:0+flush-179:022:00:010
284233999123117,4cyclictest2908247-21kworker/u8:3+events_unbound23:05:000
284233999121113,6cyclictest2911426-21kworker/u8:0+flush-179:022:45:230
284233999121110,8cyclictest2931066-21latency_hist23:45:020
284234199120111,7cyclictest2906666-21latency_hist22:30:011
284233999117111,5cyclictest2908247-21kworker/u8:3+events_unbound22:40:000
284233999116108,6cyclictest2848840-21kworker/u8:1+events_unbound19:35:010
284234199115104,9cyclictest2922833-21/usr/sbin/munin23:20:251
284233999115103,10cyclictest2847013-21latency_hist19:25:010
284233999113105,5cyclictest2893710-21kworker/u8:3+flush-179:022:15:000
284233999113104,6cyclictest2853639-21latency_hist19:45:000
284233999113103,7cyclictest2840426-21kworker/u8:3+flush-179:019:15:170
284234199111100,9cyclictest2880940-21apt-get21:10:111
284233999110102,6cyclictest2885509-21kworker/u8:3+events_unbound21:30:030
284234199109101,6cyclictest2916890-21kworker/u8:0+flush-179:023:10:271
284233999109100,7cyclictest2890486-21latency_hist21:40:010
28423399910889,14cyclictest2926038-21apt-get23:30:000
28423399910799,5cyclictest2893710-21kworker/u8:3+flush-179:022:15:260
28423419910699,5cyclictest2890539-21kworker/u8:0+flush-179:022:25:011
28423419910696,8cyclictest2935824-40logrotate00:00:011
28423399910699,5cyclictest2943320-21kworker/u8:2+events_unbound00:25:010
28423399910492,9cyclictest2934472-21kworker/u8:0+events_unbound00:05:010
28423399910394,5cyclictest2856844-21kworker/u8:0+flush-179:020:05:240
28423399910389,9cyclictest2898457-21latency_hist22:05:010
28423399910291,8cyclictest2914619-21latency_hist22:55:010
28423399910093,5cyclictest2925991-21kworker/u8:1+flush-179:023:40:010
2842341999991,6cyclictest2877549-21kworker/u8:0+flush-179:021:15:261
2842339999988,8cyclictest2849034-21cat19:30:020
2842341999783,10cyclictest1213033-21systemd-journal19:25:011
2842341999687,7cyclictest2947291-21apt-get00:35:131
2842341999681,8cyclictest2925991-21kworker/u8:1+flush-179:023:45:161
2842341999681,8cyclictest2925991-21kworker/u8:1+flush-179:023:45:161
2842339999689,5cyclictest2934472-21kworker/u8:0+flush-179:000:20:010
2842339999588,5cyclictest2875493-21kworker/u8:1+flush-179:020:55:170
2842339999587,6cyclictest2916890-21kworker/u8:0+flush-179:023:10:000
2842341999485,7cyclictest2889153-21apt-get21:35:131
2842341999482,9cyclictest2843820-21latency_hist19:15:011
2842339999487,4cyclictest2929524-21kworker/u8:3+events_unbound23:50:140
2842339999487,4cyclictest2863175-21latency_hist20:15:010
2842339999085,4cyclictest2935891-21kworker/u8:1+flush-179:000:10:000
2842339999085,4cyclictest2935891-21kworker/u8:1+flush-179:000:09:590
2842341998979,8cyclictest2908491-21/usr/sbin/munin22:35:161
2842341998979,7cyclictest2890542-21kworker/u8:2+flush-179:021:50:241
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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