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2026-03-19 - 13:38
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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 Thu Mar 19, 2026 00:44:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
207536299121108,10cyclictest266-21systemd-journal00:04:011
207536299113105,6cyclictest2107908-21kworker/u8:3+flush-179:021:14:551
20753599910395,5cyclictest2111277-21kworker/u8:1+events_unbound21:55:000
2075359999686,8cyclictest266-21systemd-journal00:00:000
2075362999585,7cyclictest2088250-21latency_hist19:50:011
2075362998977,9cyclictest2109448-21latency_hist20:55:011
2075362998578,5cyclictest2145566-21apt-get22:45:031
2075359998575,8cyclictest2179535-21latency_hist00:30:010
2075359998377,5cyclictest2148968-21kworker/u8:2+flush-179:023:50:000
2075359998373,7cyclictest2132805-21/usr/sbin/munin22:05:220
2075362998268,11cyclictest2076861-21apt-get19:15:001
2075362997971,6cyclictest2081935-21kworker/u8:2+events_unbound19:35:001
2075362997667,7cyclictest510-21rs:main1
2075359997565,7cyclictest2148968-21kworker/u8:2+flush-179:023:40:010
2075359997565,7cyclictest2148968-21kworker/u8:2+flush-179:023:40:010
2075362997464,8cyclictest2143726-21latency_hist22:40:011
2075359997465,6cyclictest2181123-21latency_hist00:35:000
2075362997365,6cyclictest2157209-21latency_hist23:20:011
2075362997363,8cyclictest2083733-21apt-get19:35:101
2075359997366,5cyclictest2092696-21kworker/u8:2+flush-179:020:35:170
2075359997262,7cyclictest2092696-21kworker/u8:2+events_unbound20:50:000
2075362997164,5cyclictest2148968-21kworker/u8:2+flush-179:023:00:171
2075362997162,6cyclictest2148968-21kworker/u8:2+events_unbound00:00:001
2075362997063,5cyclictest2103121-21kworker/u8:0+flush-179:020:40:001
2075359996963,4cyclictest2158837-21kworker/u8:3+flush-179:000:05:180
2075359996758,8cyclictest2148968-21kworker/u8:2+events_unbound23:35:000
2075359996757,8cyclictest266-21systemd-journal00:40:000
207536299661,60cyclictest2127559-21systemd21:50:001
2075359996659,5cyclictest2111277-21kworker/u8:1+flush-179:021:50:010
2075359996560,3cyclictest2158837-21kworker/u8:3+flush-179:000:05:000
2075359996558,5cyclictest266-21systemd-journal00:15:010
2075362996457,5cyclictest2173167-21kworker/u8:1+flush-179:000:15:001
2075362996242,3cyclictest484-21dbus-daemon22:15:011
2075359995946,10cyclictest2129627-21apt-get21:55:110
2075359995946,10cyclictest2129627-21apt-get21:55:100
2075362995850,6cyclictest2143152-21kworker/u8:2+flush-179:022:40:211
2075359995855,2cyclictest2145026-21kworker/u8:0+events_unbound22:50:240
2075359995850,6cyclictest2098053-21apt-get20:20:010
2075359995848,7cyclictest2085322-21/usr/sbin/munin19:40:220
2075362995750,4cyclictest2122750-21latency_hist21:35:011
2075359995748,6cyclictest2098585-21kworker/u8:1+flush-179:020:20:150
2075362995549,4cyclictest2107908-21kworker/u8:3+flush-179:021:15:011
2075362995548,5cyclictest2107908-21kworker/u8:3+flush-179:021:00:001
2075362995545,7cyclictest2075237-21latency_hist19:10:031
2075359995547,6cyclictest2055739-21kworker/u8:0+flush-179:019:25:200
2075362995449,4cyclictest2132612-21kworker/u8:3+flush-179:022:05:161
2075362995447,5cyclictest2090094-21latency_hist19:55:011
2075362995445,7cyclictest2147378-21kworker/u8:1+flush-179:022:55:221
2075362995348,3cyclictest2055739-21kworker/u8:0+flush-179:019:20:191
2075362995345,7cyclictest2124392-21kworker/u8:2+flush-179:021:50:211
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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