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2025-12-27 - 13:54
OSADL QA Farm

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of system in rack #b, slot #1

Rack #0/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #1/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #2/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #3/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #4/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #5/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #6/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #7/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #8/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #9/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #a/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #b/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #c/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #d/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #e/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #f/#0 #1 #2 #3 #4 #5 #6 #7 #8 
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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

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 50 highest latencies:
System rackbslot1.osadl.org (updated Fri Dec 26, 2025 12:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)		T*(,W**)
latency
(µs)		CmdPIDPrioCmd
8351802205182,13sleep20-21swapper/207:09:032
8352172203179,14sleep00-21swapper/007:09:280
8350872194165,19sleep30-21swapper/307:07:513
8351452188166,13sleep10-21swapper/107:08:381
97997021040,2sleep13125721-21chrome09:25:261
835657998174,4cyclictest3125721-21chrome10:45:020
83566699668,17cyclictest997987-21chrome09:45:002
83566499669,52cyclictest3125721-21chrome09:45:011
835664996560,3cyclictest841603-21/usr/share/muni07:15:071
83565799651,18cyclictest247557-21chrome09:45:010
835664995854,3cyclictest983996-21kworker/u8:1+flush-179:010:05:201
835666995652,3cyclictest939191-21kworker/u8:3+flush-179:009:10:102
835666995650,5cyclictest1142297-31munin-html12:00:392
835664995651,4cyclictest1142695-21munin-update12:05:341
835664995651,4cyclictest1142695-21munin-update12:05:341
835657995653,2cyclictest1009049-21kworker/u8:0+events_unbound10:05:000
835666995551,3cyclictest824819-21kworker/u8:4+flush-179:009:05:032
835664995450,3cyclictest824819-21kworker/u8:4+flush-179:010:00:121
835657995453,1cyclictest738625-21kworker/u8:0+flush-179:007:15:240
835666995351,2cyclictest1009049-21kworker/u8:0+flush-179:010:20:012
835657995350,2cyclictest1044033-21kworker/u8:1+flush-179:012:00:010
835657995350,2cyclictest1044033-21kworker/u8:1+flush-179:012:00:010
835657995348,4cyclictest846744-21kworker/u8:1+events_unbound08:23:340
835666995147,3cyclictest1049370-21kworker/u8:2+flush-179:010:40:012
835657995147,3cyclictest1049198-21kworker/u8:0+events_unbound11:00:190
835666995045,3cyclictest1105427-21kworker/u8:0+flush-179:011:30:042
835666995044,5cyclictest945596-21/usr/share/muni08:55:062
835664995047,2cyclictest857257-21kworker/u8:3+events_unbound08:02:021
835664995047,2cyclictest857257-21kworker/u8:3+events_unbound08:02:021
835657995045,3cyclictest824819-21kworker/u8:4+events_unbound08:14:190
835666994945,3cyclictest1049198-21kworker/u8:0+flush-179:011:05:132
835664994944,3cyclictest939191-21kworker/u8:3+flush-179:009:30:081
835664994943,4cyclictest824819-21kworker/u8:4+flush-179:009:09:581
835664994942,5cyclictest247516-21Chrome_ChildIOT07:50:331
835657994946,2cyclictest1090758-21kworker/u8:2+flush-179:011:30:320
835657994944,3cyclictest1044033-21kworker/u8:1+events_unbound11:53:460
835657994942,6cyclictest893857-21/usr/share/muni08:05:020
835657994942,2cyclictest983996-21kworker/u8:1+events_unbound09:35:230
835664994844,3cyclictest846744-21kworker/u8:1+flush-179:008:15:051
835664994844,3cyclictest1044033-21kworker/u8:1+events_unbound11:00:211
835664994844,2cyclictest965407-21kworker/u8:2+flush-179:009:15:171
835664994842,4cyclictest1096356-21/usr/share/muni11:20:021
835657994847,1cyclictest835323-21kworker/u8:2+flush-179:007:10:090
835657994845,2cyclictest846744-21kworker/u8:1+events_unbound08:25:190
835657994845,2cyclictest835323-21kworker/u8:2+flush-179:007:30:260
835657994845,2cyclictest824819-21kworker/u8:4+flush-179:010:25:260
835657994845,2cyclictest824819-21kworker/u8:4+events_unbound08:45:110
835657994845,2cyclictest1044033-21kworker/u8:1+flush-179:011:35:250
835670994743,3cyclictest1116702-21kworker/u8:0+events_unbound11:44:593
835666994745,1cyclictest1111432-21kworker/u8:3+flush-179:012:15:132
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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