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2026-08-21 - 20:54
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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 Aug 21, 2026 12:44:50)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
402111599143130,9cyclictest4083400-21latency_hist10:25:010
402111799136121,12cyclictest1213033-21systemd-journal11:35:001
402111799132121,8cyclictest510-21rs:main1
402111599129120,6cyclictest4054720-21latency_hist08:55:000
402111799126116,8cyclictest4044920-21latency_hist08:25:021
402111599126115,8cyclictest4107891-21latency_hist11:40:010
402111799125111,11cyclictest1213033-21systemd-journal08:50:001
402111799122113,6cyclictest4032181-21latency_hist07:45:001
402111599121107,8cyclictest1-21systemd11:35:000
402111599120115,3cyclictest4065878-21latency_hist09:30:010
402111599117107,6cyclictest4051336-21true08:45:010
402111599116108,6cyclictest4018025-21kworker/u8:3+events_unbound07:15:000
402111599115107,6cyclictest4094835-21apt-get10:57:580
40211179911399,12cyclictest4059540-21kworker/u8:3+flush-179:009:55:151
40211179910693,9cyclictest4054703-21kworker/u8:2+flush-179:009:00:001
40211179910594,8cyclictest4025790-21latency_hist07:25:001
40211179910294,6cyclictest4032214-21kworker/u8:0+flush-179:008:10:211
40211179910292,7cyclictest4061328-21/usr/sbin/munin09:15:231
40211179910288,10cyclictest1213033-21systemd-journal10:57:551
40211179910192,6cyclictest4099641-21latency_hist11:15:011
4021115999887,8cyclictest510-21rs:main0
4021115999687,7cyclictest4103132-21kworker/u8:0+events_unbound11:30:010
4021117999572,20cyclictest4072790-21diskstats09:50:141
4021117999489,4cyclictest4032214-21kworker/u8:0+flush-179:007:45:211
4021115999484,7cyclictest4090031-21latency_hist10:45:010
4021117999185,4cyclictest4072283-21kworker/u8:0+flush-179:010:35:201
4021117998980,7cyclictest4077073-21kworker/u8:2+flush-179:010:10:001
4021115998981,6cyclictest4009602-21kworker/u8:0+flush-179:007:25:190
4021117998780,5cyclictest4121928-21kworker/u8:0+flush-179:012:25:111
4021115998779,6cyclictest4006140-21kworker/u8:1+events_unbound07:15:240
4021115998776,8cyclictest4077073-21kworker/u8:2+flush-179:010:10:140
4021117998681,3cyclictest4077073-21kworker/u8:2+flush-179:010:10:251
4021117998676,7cyclictest4106513-21/usr/sbin/munin11:35:161
4021117998578,5cyclictest4104925-21kworker/u8:2+events_unbound11:45:241
4021123998477,5cyclictest4069070-21turbostat09:40:003
4021117998476,5cyclictest4104925-21kworker/u8:2+flush-179:011:55:261
4021117998274,5cyclictest4059540-21kworker/u8:3+flush-179:009:25:171
4021117998273,7cyclictest1213033-21systemd-journal09:00:551
4021117998169,9cyclictest4067450-21kworker/u8:1+flush-179:010:00:161
4021115998171,8cyclictest4054703-21kworker/u8:2+events_unbound09:30:190
4021117998070,7cyclictest4081850-21kworker/u8:3+events_unbound10:30:141
4021117997970,7cyclictest4069068-21latency_hist09:40:001
4021117997969,8cyclictest4104925-21kworker/u8:2+flush-179:012:30:231
4021115997972,6cyclictest4104925-21kworker/u8:2+flush-179:011:50:270
4021115997970,7cyclictest4081850-21kworker/u8:3+flush-179:010:30:210
4021115997969,8cyclictest4075697-21apt-get10:00:110
4021115997968,9cyclictest4104925-21kworker/u8:2+flush-179:012:35:190
4021117997770,5cyclictest4091870-21kworker/u8:2+flush-179:011:00:131
4021117997769,5cyclictest4104925-21kworker/u8:2+flush-179:012:15:241
4021117997766,8cyclictest4104925-21kworker/u8:2+flush-179:012:00:201
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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