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2026-06-12 - 03:52
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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 Jun 12, 2026 00:44:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
166136599128118,7cyclictest1696821-21latency_hist21:00:011
166136599122111,8cyclictest1709815-21latency_hist21:40:011
16613639911297,11cyclictest1213033-21systemd-journal22:05:000
16613639911198,10cyclictest1213033-21systemd-journal00:03:590
16613639910981,17cyclictest1751490-21latency_hist23:50:010
16613639910796,8cyclictest1762673-21kworker/u8:1+flush-179:000:35:260
16613639910595,7cyclictest1695216-21latency_hist20:55:010
16613659910089,8cyclictest1213033-21systemd-journal20:20:001
16613659910077,20cyclictest1706621-21latency_hist21:30:011
16613639910087,9cyclictest1661245-21kworker/u8:1+events_unbound19:15:010
1661365999687,6cyclictest1691765-21kworker/u8:0+flush-179:020:45:011
1661363999684,8cyclictest1753071-21kworker/u8:1+events_unbound00:00:000
1661365999586,6cyclictest1738500-21latency_hist23:10:011
1661365999487,5cyclictest1675592-21kworker/u8:0+flush-179:019:55:201
1661363999281,8cyclictest1719353-21latency_hist22:10:010
1661363998979,7cyclictest1687007-21latency_hist20:30:010
1661365998879,7cyclictest1735510-21kworker/u8:0+flush-179:023:30:161
1661365998578,5cyclictest1665142-21kworker/u8:0+flush-179:019:40:221
1661365998577,6cyclictest1740375-21kworker/u8:1+flush-179:023:20:011
1661363998574,8cyclictest1715111-21diskstats21:55:140
1661365998376,4cyclictest1757900-21kworker/u8:3+flush-179:000:20:211
1661365998370,11cyclictest1213033-21systemd-journal00:20:011
1661365998370,11cyclictest1213033-21systemd-journal00:20:001
1661365998346,22cyclictest1717767-21latency_hist22:05:001
1661363998377,4cyclictest1746145-21kworker/u8:1+events_unbound23:40:010
1661363998271,9cyclictest1677180-21kworker/u8:2+events_unbound20:15:010
1661363998171,8cyclictest1692043-21apt-get20:45:110
1661363998169,9cyclictest1661245-21kworker/u8:1+flush-179:019:15:240
1661365998076,2cyclictest1688579-21kworker/u8:2+events_unbound20:40:011
1661365998073,5cyclictest1669225-21kworker/u8:3+flush-179:019:35:011
1661363997971,6cyclictest1735511-21/usr/sbin/munin23:00:170
1661363997971,6cyclictest1711401-21latency_hist21:45:010
1661365997462,9cyclictest1693374-21latency_hist20:50:011
1661363997466,5cyclictest1754735-21kworker/u8:0+flush-179:000:10:190
1661365997364,6cyclictest1711434-21kworker/u8:3+events_unbound21:55:231
1661363997365,5cyclictest1727303-21latency_hist22:35:010
1661363997354,17cyclictest1685174-21apt-get20:25:000
1661365997268,3cyclictest1675592-21kworker/u8:0+flush-179:020:12:211
1661365997265,5cyclictest1720972-21kworker/u8:2+flush-179:022:25:301
1661365997063,5cyclictest1743569-21kworker/u8:2+events_unbound23:45:001
166137099690,66cyclictest0-21swapper/320:39:593
1661365996963,4cyclictest1685297-21kworker/u8:3+flush-179:020:30:221
1661365996861,5cyclictest1720972-21kworker/u8:2+events_unbound23:00:241
1661365996858,7cyclictest1711434-21kworker/u8:3+flush-179:022:40:241
1661365996762,4cyclictest1693354-21kworker/u8:1+flush-179:021:05:211
1661365996762,4cyclictest1693354-21kworker/u8:1+flush-179:021:05:211
1661365996759,6cyclictest1213033-21systemd-journal22:53:251
1661363996754,10cyclictest1693354-21kworker/u8:1+flush-179:021:00:210
1661365996657,7cyclictest1743792-21apt-get23:25:101
1661363996657,7cyclictest1754735-21kworker/u8:0+events_unbound00:10:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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