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2025-11-24 - 10:26
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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 Nov 24, 2025 00:44:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
17730519910797,7cyclictest1878321-21latency_hist00:35:000
17730529910082,8cyclictest1777793-21latency_hist19:25:001
1773052999783,10cyclictest271-21systemd-journal00:09:591
1773052999684,8cyclictest1863680-21latency_hist23:50:001
1773052998777,7cyclictest1843001-21latency_hist22:45:011
1773052998476,6cyclictest1854320-21kworker/u8:1+flush-179:023:30:251
1773052998171,7cyclictest1829751-21latency_hist22:05:011
1773051997967,10cyclictest1868523-21apt-get00:05:010
1773052997766,8cyclictest1825208-21/usr/sbin/munin21:50:231
1773051997771,5cyclictest1787565-21kworker/u8:0+events_unbound20:05:010
1773051997770,5cyclictest1813588-21kworker/u8:3+flush-179:021:25:180
1773051997569,5cyclictest1870393-21kworker/u8:1+flush-179:000:15:280
1773052997465,7cyclictest1855968-21/usr/sbin/munin23:25:241
1773051997369,2cyclictest723-21Xorg20:30:590
1773051997264,6cyclictest1829786-21kworker/u8:3+flush-179:023:15:010
1773051997161,7cyclictest1839549-21latency_hist22:35:010
1773051997062,5cyclictest1790560-21kworker/u8:1+flush-179:020:15:190
1773052996859,7cyclictest1792112-21latency_hist20:10:001
1773051996861,4cyclictest1813588-21kworker/u8:3+flush-179:021:35:220
1773052996659,5cyclictest1813588-21kworker/u8:3+flush-179:021:25:251
1773051996353,7cyclictest1860500-21latency_hist23:40:010
1773051996353,7cyclictest1797147-21latency_hist20:25:010
1773057996255,5cyclictest1879935-21turbostat00:39:593
1773051996156,3cyclictest1803749-21kworker/u8:0+flush-179:021:10:260
1773051996150,8cyclictest1806922-21kworker/u8:3+events_unbound20:55:030
1773051996053,5cyclictest271-21systemd-journal23:04:590
1773052995948,8cyclictest271-21systemd-journal20:50:001
1773051995948,9cyclictest1800575-21apt-get20:35:140
1773052995851,4cyclictest1829786-21kworker/u8:3+flush-179:022:10:231
1773051995750,5cyclictest1829786-21kworker/u8:3+flush-179:023:25:170
1773051995749,5cyclictest1834514-21latency_hist22:20:010
1773051995748,6cyclictest1841113-21kworker/u8:1+events_unbound22:40:230
1773051995748,6cyclictest1787327-21latency_hist19:55:010
1773051995742,8cyclictest1829786-21kworker/u8:3+events_unbound22:20:020
1773052995648,5cyclictest1780966-21latency_hist19:35:021
1773052995612,1cyclictest723-21Xorg23:19:001
1773051995649,5cyclictest1829786-21kworker/u8:3+flush-179:022:10:250
1773051995646,8cyclictest1854402-21apt-get23:20:160
1773052995548,5cyclictest271-21systemd-journal19:26:201
1773051995548,4cyclictest1854320-21kworker/u8:1+flush-179:023:50:250
1773052995346,5cyclictest1805107-21apt-get20:50:041
1773051995347,4cyclictest1777828-21kworker/u8:0+flush-179:019:40:240
1773051995342,8cyclictest1844620-21kworker/u8:2+events_unbound22:55:010
1773052995240,9cyclictest1793712-21apt-get20:15:011
1773051995247,4cyclictest1829786-21kworker/u8:3+events_unbound23:05:240
1773051995246,4cyclictest1788777-21kworker/u8:2+flush-179:020:10:180
1773051995242,7cyclictest1879926-21latency_hist00:40:010
1773052995141,7cyclictest1847775-21latency_hist23:00:011
1773051995142,6cyclictest1803749-21kworker/u8:0+events_unbound20:50:010
1773052995044,4cyclictest0-21swapper/122:23:591
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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