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2026-05-17 - 14:51
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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 Sun May 17, 2026 00:44:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
169614699117105,8cyclictest1799041-21latency_hist00:30:011
16961469910887,19cyclictest1789443-40mandb00:00:011
16961469910690,12cyclictest1785976-21latency_hist23:50:011
16961469910495,7cyclictest1707221-21kworker/u8:2+flush-179:021:20:001
16961429910093,6cyclictest1744128-21kworker/u8:0+flush-179:021:50:000
1696142999683,9cyclictest1213033-21systemd-journal23:45:000
1696142999579,11cyclictest1802230-21latency_hist00:40:010
1696146999287,4cyclictest1707221-21kworker/u8:2+flush-179:020:15:151
1696142999279,10cyclictest1213033-21systemd-journal23:05:000
1696146999183,6cyclictest1703968-21kworker/u8:0+flush-179:019:40:001
1696146999183,6cyclictest1703968-21kworker/u8:0+flush-179:019:40:001
1696146999082,5cyclictest1683340-21kworker/u8:1+flush-179:019:10:261
1696146999081,6cyclictest1800637-21latency_hist00:35:011
1696146999076,11cyclictest1744062-21latency_hist21:40:021
1696142998778,6cyclictest1716725-21latency_hist20:15:010
1696146998680,5cyclictest1692969-21kworker/u8:3+events_unbound19:20:001
1696146998679,5cyclictest1707221-21kworker/u8:2+flush-179:021:05:171
1696146998678,6cyclictest1703968-21kworker/u8:0+flush-179:019:45:001
1696142998677,6cyclictest1732921-21latency_hist21:05:010
1696146998477,5cyclictest1763657-21kworker/u8:2+flush-179:022:40:161
1696146998471,9cyclictest1787797-21kworker/u8:3+flush-179:000:05:191
1696146998172,6cyclictest1766848-21kworker/u8:3+flush-179:023:15:201
1696146998172,6cyclictest1700860-21kworker/u8:2+flush-179:019:30:401
1696146998171,8cyclictest1710594-21/usr/sbin/munin19:55:231
1696142998074,4cyclictest1792705-21kworker/u8:1+flush-179:000:30:010
1696146997969,8cyclictest1737737-21kworker/u8:3+flush-179:021:40:201
1696146997871,6cyclictest1704026-21kworker/u8:3+events_unbound20:25:011
1696146997868,8cyclictest1787820-21latency_hist23:55:001
1696142997870,6cyclictest1704026-21kworker/u8:3+flush-179:020:30:150
1696146997670,4cyclictest1792705-21kworker/u8:1+events_unbound00:15:001
1696146997670,4cyclictest1713540-21kworker/u8:1+flush-179:020:05:171
1696146997569,4cyclictest1756266-21kworker/u8:0+flush-179:022:30:211
1696146997565,8cyclictest1744133-21kworker/u8:1+flush-179:021:45:201
1696146997565,8cyclictest1737737-21kworker/u8:3+flush-179:021:30:201
1696146997564,8cyclictest1739291-21latency_hist21:25:011
1696142997563,8cyclictest1744068-21apt-get21:40:010
1696146997468,4cyclictest1756266-21kworker/u8:0+flush-179:022:55:151
1696146997468,4cyclictest1719958-21kworker/u8:1+flush-179:020:50:151
1696146997464,7cyclictest1756266-21kworker/u8:0+flush-179:023:00:201
1696146997267,4cyclictest1777998-21kworker/u8:1+events_unbound23:25:251
1696146997266,4cyclictest1719958-21kworker/u8:1+flush-179:020:40:241
1696146997265,4cyclictest1707221-21kworker/u8:2+events_unbound20:00:131
1696146997166,3cyclictest1692969-21kworker/u8:3+flush-179:019:20:151
1696146997165,5cyclictest1756266-21kworker/u8:0+flush-179:022:49:561
1696146997164,5cyclictest1719958-21kworker/u8:1+events_unbound20:40:001
1696146997162,5cyclictest1756742-21kworker/u8:2+flush-179:022:20:161
1696142997157,11cyclictest1213033-21systemd-journal00:00:000
1696146997064,4cyclictest1737737-21kworker/u8:3+flush-179:022:15:001
1696146997061,6cyclictest1744133-21kworker/u8:1+flush-179:021:55:211
1696142997045,17cyclictest1751212-21apt-get22:00:110
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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