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2026-03-20 - 22:34
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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 Mar 20, 2026 12:44:50)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
20805699911488,22cyclictest2104943-21latency_hist08:25:001
20805699910780,8cyclictest2173291-21/usr/sbin/munin11:55:231
20805699910093,5cyclictest2177860-21kworker/u8:2+events_unbound12:15:231
2080569999988,9cyclictest2146248-21/usr/sbin/munin10:30:221
2080568999682,10cyclictest1-21systemd09:40:000
2080569999485,6cyclictest2093283-21latency_hist07:50:021
2080569999485,6cyclictest2093283-21latency_hist07:50:011
2080568999480,11cyclictest2101491-21latency_hist08:15:010
2080569999386,5cyclictest2114975-21kworker/u8:0+events_unbound09:10:001
2080569998355,19cyclictest2142533-21kworker/u8:2+flush-179:010:20:011
2080569998355,19cyclictest2142533-21kworker/u8:2+flush-179:010:20:011
2080569998275,4cyclictest2095162-21kworker/u8:3+events_unbound08:15:251
2080569998275,4cyclictest2093160-21kworker/u8:0+flush-179:007:50:011
2080569998074,4cyclictest2061211-21kworker/u8:0+flush-179:007:35:001
2080569997871,5cyclictest2163549-21kworker/u8:0+flush-179:011:35:001
2080569997765,5cyclictest2142616-21kworker/u8:3+events_unbound10:25:001
2080568997767,7cyclictest2184191-21latency_hist12:30:010
2080569997568,5cyclictest2160323-21latency_hist11:15:011
2080569997568,4cyclictest2144842-21kworker/u8:1+flush-179:010:50:201
2080569997467,5cyclictest2114975-21kworker/u8:0+flush-179:009:25:001
2080569997365,5cyclictest2108104-21kworker/u8:4+flush-179:008:50:251
2080569997266,4cyclictest2155010-21kworker/u8:0+flush-179:010:59:591
2080569997265,4cyclictest2149747-21kworker/u8:2+events_unbound10:45:181
2080569997262,7cyclictest2103312-21kworker/u8:0+flush-179:008:30:001
2080569997163,6cyclictest2166724-21kworker/u8:2+flush-179:011:50:241
2080568997164,5cyclictest2155010-21kworker/u8:0+events_unbound11:00:120
2080569997059,9cyclictest2185777-21latency_hist12:35:001
2080569996964,3cyclictest2173095-21kworker/u8:3+flush-179:012:05:101
2080569996963,4cyclictest2114975-21kworker/u8:0+flush-179:009:15:151
2080569996960,6cyclictest2144842-21kworker/u8:1+events_unbound10:35:201
2080569996761,4cyclictest2173095-21kworker/u8:3+flush-179:012:25:011
2080568996760,4cyclictest2096736-21latency_hist08:00:000
2080569996558,5cyclictest2061211-21kworker/u8:0+flush-179:007:30:011
2080568996560,4cyclictest2137777-21kworker/u8:2+events_unbound10:02:390
2080568996560,4cyclictest2095106-21kworker/u8:2+events_unbound08:08:400
2080568996556,6cyclictest2090104-21latency_hist07:40:000
2080569996462,1cyclictest0-21swapper/107:39:581
2080569996456,6cyclictest2129391-21kworker/u8:2+flush-179:009:45:201
2080569996455,6cyclictest2150792-21latency_hist10:45:011
2080568996458,4cyclictest2144842-21kworker/u8:1+events_unbound10:50:020
2080568996359,3cyclictest2147576-21kworker/u8:0+events_unbound10:32:380
2080568996358,4cyclictest2082161-21kworker/u8:1+events_unbound07:20:240
2080568996353,8cyclictest2185794-21apt-get12:35:000
2080569996254,5cyclictest2061211-21kworker/u8:0+flush-179:007:20:001
2080569996253,6cyclictest2116345-21latency_hist09:00:011
2080568996258,3cyclictest2117968-21kworker/u8:2+events_unbound09:18:390
2080568996258,3cyclictest2095106-21kworker/u8:2+events_unbound08:32:380
2080568996258,3cyclictest2093160-21kworker/u8:0+events_unbound07:47:400
2080568996258,3cyclictest2093160-21kworker/u8:0+events_unbound07:47:390
2080568996157,3cyclictest2166724-21kworker/u8:2+events_unbound11:36:370
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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