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2025-11-05 - 13:08
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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 20 highest latencies:
System rackeslot6.osadl.org (updated Wed Nov 05, 2025 00:44:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
125432799107102,4cyclictest1346978-21kworker/u8:1+events_unbound00:04:020
12543279910693,10cyclictest1321031-21latency_hist22:40:010
1254327999181,7cyclictest1293187-21latency_hist21:15:010
1254327998983,5cyclictest1254268-21kworker/u8:1+flush-179:019:25:230
125432799891,86cyclictest1-21systemd22:45:010
1254327998580,4cyclictest1334320-21kworker/u8:2+events_unbound23:35:000
1254327998475,3cyclictest1251245-21kworker/u8:2+events_unbound19:15:250
1254327998273,7cyclictest1318080-21/usr/sbin/munin22:30:260
1254327998176,4cyclictest1304567-21kworker/u8:0+events_unbound22:15:240
1254327998173,6cyclictest271-21systemd-journal21:55:000
1254327998173,6cyclictest271-21systemd-journal21:55:000
1254327997971,5cyclictest1304628-21kworker/u8:2+flush-179:022:00:000
1254330997767,7cyclictest1275418-21latency_hist20:15:001
1254330997767,7cyclictest1275418-21latency_hist20:15:001
1254327997764,10cyclictest1301163-21latency_hist21:40:010
1254327997672,3cyclictest1355255-21kworker/u8:0+events_unbound00:30:250
1254327997566,7cyclictest1332427-21apt-get23:15:000
1254327997364,4cyclictest1288138-21kworker/u8:1+events_unbound21:25:240
1254327997163,6cyclictest1255803-21latency_hist19:15:020
1254327997066,3cyclictest1346978-21kworker/u8:1+events_unbound00:20:250
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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