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2025-11-21 - 10:07
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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 Nov 21, 2025 00:44:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
17098649910391,8cyclictest1778701-21latency_hist22:45:001
1709861999481,10cyclictest1770741-21latency_hist22:20:000
1709861999166,22cyclictest1720899-21latency_hist19:45:010
1709861998878,7cyclictest1756156-21latency_hist21:35:010
1709864998776,8cyclictest271-21systemd-journal21:25:001
1709864998776,8cyclictest271-21systemd-journal21:25:001
1709864998375,5cyclictest1795126-21apt-get23:35:031
1709864997564,8cyclictest1765712-21latency_hist22:05:011
1709861997569,5cyclictest1793567-21kworker/u8:3+flush-179:023:40:240
1709861997468,4cyclictest1800389-21kworker/u8:2+flush-179:023:50:250
1709861997464,7cyclictest1743162-21latency_hist20:55:010
4670791730,18ptp4l61690irq/136-eno1-TxRx-019:07:313
1709861997364,6cyclictest1800412-21latency_hist23:50:020
1709861997364,5cyclictest1805205-21systemd00:03:590
1709864997264,5cyclictest1759587-21/usr/sbin/munin21:45:251
1709864997259,10cyclictest271-21systemd-journal22:15:011
1709864997252,18cyclictest1791924-21kworker/u8:0+flush-179:023:30:241
1709864997162,7cyclictest1733629-21latency_hist20:25:011
1709864997064,4cyclictest1791924-21kworker/u8:0+flush-179:023:45:231
1709861997059,8cyclictest1759350-21latency_hist21:45:010
1709864996959,7cyclictest1709726-21latency_hist19:10:031
1709861996860,6cyclictest1746006-21kworker/u8:2+events_unbound21:15:140
1709861996859,6cyclictest1760933-21latency_hist21:50:020
1709864996762,4cyclictest1736780-21kworker/u8:0+flush-179:020:50:261
1709864996753,12cyclictest271-21systemd-journal21:40:001
1709861996761,4cyclictest1785358-21kworker/u8:2+flush-179:023:25:210
1709861996761,4cyclictest1785358-21kworker/u8:2+flush-179:023:25:200
170986699660,63cyclictest0-21swapper/219:28:582
1709864996657,6cyclictest1745007-21/usr/sbin/munin21:00:241
1709864996655,8cyclictest1749787-21latency_hist21:15:011
1709864996559,4cyclictest1734690-21kworker/u8:1+flush-179:020:30:301
1709864996554,9cyclictest1738666-21apt-get20:40:151
1709864996554,8cyclictest1785865-21diskstats23:05:191
1709861996557,6cyclictest1753019-21kworker/u8:3+flush-179:022:00:170
1709861996153,6cyclictest1736780-21kworker/u8:0+flush-179:020:35:250
1709870996056,2cyclictest0-21swapper/321:46:593
1709864996050,7cyclictest1781871-21latency_hist22:55:021
1709861996055,4cyclictest1778691-21kworker/u8:1+flush-179:023:00:150
1709861996053,5cyclictest1810000-21kworker/u8:1+flush-179:000:25:240
1709864995949,8cyclictest1787145-21/usr/sbin/munin23:10:241
1709864995949,6cyclictest1767588-21kworker/u8:1+flush-179:022:20:271
170986499590,2cyclictest0-21swapper/120:29:591
170986199581,54cyclictest1811680-21munin-run00:25:010
1709864995746,8cyclictest1773920-21latency_hist22:30:001
1709861995753,3cyclictest1709782-21kworker/u8:1+flush-179:019:25:170
1709861995750,5cyclictest1709782-21kworker/u8:1+flush-179:019:20:150
1709861995748,7cyclictest1803617-40mandb00:00:010
1709861995649,5cyclictest1778745-21kworker/u8:3+flush-179:022:50:000
1709861995649,5cyclictest1736780-21kworker/u8:0+flush-179:020:45:180
1709861995550,4cyclictest1767588-21kworker/u8:1+flush-179:022:20:250
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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