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2026-03-25 - 12:39
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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 Mar 25, 2026 00:44:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
19543789910492,9cyclictest266-21systemd-journal20:40:010
1954379999787,8cyclictest2042575-21latency_hist23:45:021
1954378998982,5cyclictest1965661-21kworker/u8:0+flush-179:019:50:000
1954379998779,6cyclictest266-21systemd-journal20:25:001
1954379998777,7cyclictest3478898-21cups-browsed00:00:001
1954379998777,7cyclictest3478898-21cups-browsed00:00:001
1954379998671,3cyclictest2021577-21kworker/u8:0+events_unbound23:05:011
1954379997971,6cyclictest2031409-21/usr/sbin/munin23:10:221
1954379997871,5cyclictest1991379-21kworker/u8:1+flush-179:021:40:001
1954378997872,4cyclictest2040958-21kworker/u8:0+events_unbound23:40:240
1954379997670,4cyclictest1968575-21kworker/u8:1+events_unbound20:00:261
1954378997672,2cyclictest1987929-21kworker/u8:0+flush-179:021:00:000
1954378997566,7cyclictest2032758-21latency_hist23:15:010
1954379997468,4cyclictest2031206-21kworker/u8:3+events_unbound23:25:241
1954378997365,6cyclictest1957476-21latency_hist19:20:020
1954379997261,9cyclictest2034354-21apt-get23:20:011
1954378997263,6cyclictest1975221-21latency_hist20:15:010
1954378997261,9cyclictest1968852-21apt-get19:55:100
1954379997164,5cyclictest1972856-21kworker/u8:2+flush-179:020:50:221
1954379997164,4cyclictest2008697-21kworker/u8:1+flush-179:022:20:201
1954378997166,4cyclictest2043495-21kworker/u8:2+events_unbound23:50:010
1954378997166,4cyclictest2043495-21kworker/u8:2+events_unbound23:50:000
1954378997164,5cyclictest1999126-21kworker/u8:2+events_unbound22:00:000
1954378997163,5cyclictest2034367-21kworker/u8:0+flush-179:023:20:220
1954378997160,9cyclictest1973376-21latency_hist20:10:020
1954379997057,11cyclictest2046455-21kworker/u8:1+flush-179:000:20:241
1954378997064,4cyclictest1999126-21kworker/u8:2+flush-179:021:45:230
1954378997063,5cyclictest2046455-21kworker/u8:1+flush-179:023:55:230
1954378997063,5cyclictest2046455-21kworker/u8:1+flush-179:023:55:220
1954378997063,5cyclictest2021577-21kworker/u8:0+flush-179:022:45:220
1954378996962,5cyclictest2010661-21kworker/u8:0+events_unbound22:15:010
1954378996962,4cyclictest2008697-21kworker/u8:1+flush-179:022:55:210
1954378996861,5cyclictest1972856-21kworker/u8:2+events_unbound20:30:230
1954379996761,5cyclictest1987929-21kworker/u8:0+flush-179:021:05:011
1954379996760,4cyclictest1952792-21kworker/u8:3+flush-179:019:20:201
1954379996756,9cyclictest1996158-21/usr/sbin/munin21:20:231
1954378996760,5cyclictest1986621-21apt-get20:50:110
1954378996660,4cyclictest1999126-21kworker/u8:2+events_unbound21:34:590
1954379996559,4cyclictest2018480-21kworker/u8:3+events_unbound22:30:251
195437999650,62cyclictest0-21swapper/119:26:001
1954378996559,4cyclictest2008697-21kworker/u8:1+flush-179:022:35:230
1954378996559,4cyclictest1994357-21kworker/u8:3+flush-179:021:20:000
1954379996458,4cyclictest2014715-21kworker/u8:2+flush-179:022:25:231
1954379996455,7cyclictest1972856-21kworker/u8:2+flush-179:020:15:001
1954378996455,7cyclictest1960902-21apt-get19:30:120
1954378996355,6cyclictest1997506-21latency_hist21:25:010
1954379996257,4cyclictest1960883-21kworker/u8:0+flush-179:019:30:201
1954379996256,4cyclictest1985459-21kworker/u8:1+flush-179:020:45:201
1954379996254,6cyclictest2046455-21kworker/u8:1+flush-179:000:15:281
1954378996155,4cyclictest2010661-21kworker/u8:0+flush-179:022:05:230
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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