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2025-11-21 - 00:19
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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
Characteristics of the 100 highest latencies:
System rackbslot1.osadl.org (updated Thu Nov 20, 2025 12:44:44)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
17906072204180,14sleep10-21swapper/107:05:311
17911942203174,19sleep30-21swapper/307:07:103
17913272201173,18sleep00-21swapper/007:08:470
17914082188159,19sleep20-21swapper/207:09:462
193866421240,1sleep01937548-21/usr/share/muni09:30:130
1791657996246,2cyclictest1828642-21snmp_wlanswitch07:45:023
1791650996248,2cyclictest1828650-21snmp_wanswitch.07:45:020
1791657995853,3cyclictest2008747-21kworker/u8:1+flush-179:010:40:353
179165799570,3cyclictest2077105-21chrome11:45:013
179165799570,3cyclictest2077105-21chrome11:45:013
1791654995650,4cyclictest2019757-21/usr/share/muni10:50:131
18516102550,1chrt1851609-21apache_volume08:05:171
1791657995547,6cyclictest1823461-21/usr/share/muni07:40:093
1791655995550,4cyclictest2128298-21kworker/u8:0+flush-179:012:35:342
1791650995552,2cyclictest1852378-21kworker/u8:2+flush-179:008:20:100
1791657995451,2cyclictest1942041-21kworker/u8:2+flush-179:009:40:333
179165499541,51cyclictest247557-21chrome12:30:331
1791655995343,7cyclictest247561-21ThreadPoolForeg09:25:162
1791650995350,2cyclictest2003120-21kworker/u8:4+flush-179:011:00:080
1791657995146,4cyclictest1983465-21munin-update10:15:343
1791655995146,3cyclictest1952658-21kworker/u8:0+flush-179:010:25:242
1791654995148,2cyclictest1952658-21kworker/u8:0+flush-179:011:10:211
1791657995045,3cyclictest2003173-21kworker/u8:5+flush-179:010:30:333
18859712490,1chrt1885953-21snmp_wanpowerct08:40:050
1791655994938,10cyclictest1990404-21ntpq10:20:162
1791657994845,2cyclictest2058559-21kworker/u8:3+flush-179:012:25:113
1791657994844,3cyclictest1952658-21kworker/u8:0+flush-179:010:10:373
1791655994831,16cyclictest1875312-21kworker/2:2+pm09:40:062
1791654994813,34cyclictest3125728-13Compositor09:52:271
1791657994743,3cyclictest2003120-21kworker/u8:4+flush-179:011:13:583
179165599477,2cyclictest247557-21chrome09:21:562
1791655994736,8cyclictest3125687-21ThreadPoolForeg08:59:102
1791655994733,7cyclictest2097974-21kworker/2:1+pm12:10:312
1791655994732,11cyclictest1807728-21kworker/2:1+pm07:25:072
1791655994732,11cyclictest1807728-21kworker/2:1+pm07:25:072
1791650994744,2cyclictest1915862-21kworker/u8:4+flush-179:009:50:300
179165599461,14cyclictest247557-21chrome09:10:552
1791654994631,13cyclictest247560-21ThreadPoolForeg08:20:151
1791650994641,4cyclictest1932607-21/usr/share/muni09:25:090
1791657994542,2cyclictest1807482-21kworker/u8:4+flush-179:007:30:353
1791655994541,3cyclictest1952658-21kworker/u8:0+flush-179:009:55:162
1791655994541,3cyclictest1875061-21kworker/u8:2+flush-179:008:30:012
1791655994528,8cyclictest2097974-21kworker/2:1+pm12:26:182
1791655994516,2cyclictest0-21swapper/211:50:512
179165599451,2cyclictest2013766-31munin-html10:40:512
1791650994542,2cyclictest1942130-21kworker/u8:5+flush-179:009:45:150
1791650994541,3cyclictest1910931-21kworker/u8:1+flush-179:009:05:240
1791650994540,3cyclictest2058559-21kworker/u8:3+events_unbound12:30:290
1791657994440,3cyclictest1915862-21kworker/u8:4+flush-179:009:50:123
179165599446,36cyclictest3125648-13Chrome_IOThread10:49:592
1791655994437,5cyclictest1855110-21/usr/share/muni08:10:062
1791655994436,7cyclictest1875312-21kworker/2:2+pm09:31:422
1791655994436,5cyclictest1844258-21/usr/share/muni08:00:122
1791654994438,4cyclictest76405-21systemd-journal07:15:191
1791654994438,4cyclictest2056156-21kworker/u8:0+events_unbound11:25:211
1791654994436,6cyclictest247561-21ThreadPoolForeg09:17:041
1791654994434,8cyclictest2008747-21kworker/u8:1+flush-179:011:15:151
1791654994430,13cyclictest2058559-21kworker/u8:3+flush-179:012:10:521
1791650994441,2cyclictest1795936-21kworker/u8:3+flush-179:007:20:070
1791650994440,3cyclictest1840730-21kworker/u8:3+events_unbound08:50:280
1791650994437,5cyclictest2087952-21/usr/share/muni11:55:180
1791657994340,2cyclictest1505073-1kworker/3:1H+kblockd07:12:443
1791657994339,3cyclictest2003120-21kworker/u8:4+flush-179:012:20:233
1791657994339,3cyclictest1915862-21kworker/u8:4+events_unbound09:25:323
1791655994338,4cyclictest2003120-21kworker/u8:4+events_unbound11:10:002
1791655994338,3cyclictest1875312-21kworker/2:2+pm08:51:322
1791655994334,8cyclictest1978357-21latency_hist10:10:012
1791655994327,16cyclictest1875312-21kworker/2:2+pm09:02:572
1791655994322,20cyclictest3125726-13Chrome_ChildIOT08:07:202
179165599430,6cyclictest3125728-13Compositor10:36:142
1791657994238,3cyclictest1952658-21kworker/u8:0+events_unbound10:45:323
1791657994238,3cyclictest1915862-21kworker/u8:4+flush-179:009:45:193
179165599426,35cyclictest3125726-13Chrome_ChildIOT11:00:302
1791655994239,2cyclictest1962757-21kworker/2:0+pm10:18:382
1791655994238,3cyclictest1738568-21kworker/u8:0+flush-179:008:40:102
1791655994236,4cyclictest3125725-21ThreadPoolForeg12:22:252
1791655994235,6cyclictest1875312-21kworker/2:2+pm09:16:022
1791655994211,28cyclictest1972906-31munin-graph10:01:262
1791654994231,11cyclictest1812590-1kworker/1:0H+kblockd10:38:241
1791650994239,2cyclictest1983067-21kworker/u8:3+flush-179:010:20:270
1791650994238,3cyclictest2009326-21/usr/share/muni10:40:070
1791650994238,3cyclictest1928583-21apt-get09:20:130
1791650994238,3cyclictest1875061-21kworker/u8:2+flush-179:008:35:250
1791650994238,3cyclictest1812691-21kworker/u8:1+flush-179:007:55:250
1791650994238,3cyclictest1812691-21kworker/u8:1+flush-179:007:55:250
1791650994238,3cyclictest1738568-21kworker/u8:0+flush-179:007:15:170
1791657994137,3cyclictest1870491-21/usr/share/muni08:25:073
1791655994138,2cyclictest1807728-21kworker/2:1+pm07:37:462
1791655994136,3cyclictest1807728-21kworker/2:1+pm07:40:152
1791655994135,5cyclictest247561-21ThreadPoolForeg11:39:102
1791655994134,5cyclictest1833882-21/usr/share/muni07:50:162
179165599412,37cyclictest247563-13Compositor11:23:542
179165599410,14cyclictest2081928-31munin-graph11:46:022
179165599410,14cyclictest2081928-31munin-graph11:46:022
1791654994137,3cyclictest2058559-21kworker/u8:3+events_unbound12:05:191
179165499411,38cyclictest3125721-21chrome12:35:151
1791650994138,2cyclictest1812691-21kworker/u8:1+flush-179:007:53:200
1791650994137,3cyclictest2003120-21kworker/u8:4+flush-179:012:11:130
1791650994137,3cyclictest1915862-21kworker/u8:4+flush-179:010:00:110
1791657994038,1cyclictest1838618-21kworker/3:1+pm09:08:043
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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