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2026-04-13 - 14:10
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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 Mon Apr 13, 2026 00:44:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
393936599111101,7cyclictest4037534-21latency_hist00:15:011
3939364999381,9cyclictest4032470-40mandb00:00:010
3939365999282,8cyclictest4002126-21/usr/sbin/munin22:25:231
3939365998575,7cyclictest3987970-21kworker/u8:0+flush-179:021:50:231
3939365998377,4cyclictest3945672-21kworker/u8:1+flush-179:019:35:241
3939365998374,7cyclictest3984111-21latency_hist21:30:011
3939364998373,7cyclictest3982523-21latency_hist21:25:010
3939365998273,7cyclictest266-21systemd-journal21:50:001
3939364998254,2cyclictest0-21swapper/022:59:000
3939365998176,4cyclictest4031427-21kworker/u8:1+flush-179:000:00:261
3939364998063,14cyclictest4006660-21latency_hist22:40:000
3939364997761,14cyclictest3959960-21latency_hist20:15:010
3939365997567,6cyclictest3995262-21latency_hist22:05:021
3939364997568,5cyclictest3987970-21kworker/u8:0+flush-179:021:55:260
3939365997466,6cyclictest3954609-21kworker/u8:1+flush-179:019:55:241
4577091720,13ptp4l431rcuc/319:10:013
3939364997264,6cyclictest3918648-21kworker/u8:2+flush-179:019:10:260
3939365997163,6cyclictest3944048-21latency_hist19:25:011
3939365997163,6cyclictest3944048-21latency_hist19:25:011
3939365997162,7cyclictest3948835-21kworker/u8:3+flush-179:019:40:201
3939364997161,8cyclictest4034113-21apt-get00:04:590
3939364997062,5cyclictest3971371-21latency_hist20:50:010
3939365996959,8cyclictest3960473-21apt-get20:15:111
3939365996760,5cyclictest4010102-21latency_hist22:50:011
3939365996760,5cyclictest3965974-21kworker/u8:0+flush-179:020:50:181
3939365996760,5cyclictest3965974-21kworker/u8:0+flush-179:020:50:181
3939365996756,8cyclictest266-21systemd-journal21:00:001
3939364996757,7cyclictest4045762-21latency_hist00:40:020
3939365996457,5cyclictest3973553-21kworker/u8:1+flush-179:021:05:171
3939364996353,7cyclictest4016463-21kworker/u8:0+flush-179:023:15:200
3939365996252,8cyclictest266-21systemd-journal23:15:011
3939364996254,5cyclictest3942451-21latency_hist19:20:010
3939364996158,2cyclictest0-21swapper/021:40:580
3939365996052,6cyclictest3945615-21kworker/u8:0+flush-179:020:20:221
3939364996055,3cyclictest4008561-21kworker/u8:2+flush-179:023:00:210
3939365995953,4cyclictest3948835-21kworker/u8:3+flush-179:019:50:241
3939364995850,6cyclictest4036205-21apt-get00:10:120
3939365995649,5cyclictest3990514-21kworker/u8:2+flush-179:022:15:231
3939365995649,5cyclictest3987970-21kworker/u8:0+flush-179:021:55:151
3939364995649,5cyclictest3954609-21kworker/u8:1+events_unbound20:05:010
3939365995550,4cyclictest4026125-21kworker/u8:1+events_unbound23:40:011
3939365995549,5cyclictest3960021-21kworker/u8:2+flush-179:020:50:001
3939365995348,4cyclictest3979563-21kworker/u8:1+flush-179:021:20:011
3939365995341,10cyclictest3950673-21apt-get19:45:131
3939365995341,10cyclictest3950673-21apt-get19:45:131
3939365995244,6cyclictest4026125-21kworker/u8:1+flush-179:023:40:221
3939365995244,6cyclictest3988894-21latency_hist21:45:011
3939365995243,7cyclictest4044421-21apt-get00:35:121
3939364995245,5cyclictest3987970-21kworker/u8:0+events_unbound21:45:130
3939365995146,4cyclictest3937787-21kworker/u8:3+flush-179:019:25:151
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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